diff --git a/connection/main.c b/connection/main.c
index 8edaa8c5..75fd959b 100644
--- a/connection/main.c
+++ b/connection/main.c
@@ -116,20 +116,22 @@ _poll(struct connection_server * server) {
 			connection_del(server->pool, c->fd);
 			free(buffer);
 			buffer = NULL;
-			skynet_send(server->ctx, 0, c->address, SESSION_CLIENT, NULL, 0, DONTCOPY);
+			// todo: support user defined type
+			skynet_send(server->ctx, 0, c->address, PTYPE_CLIENT | PTYPE_TAG_DONTCOPY, 0, NULL, 0);
 		} else {
-			skynet_send(server->ctx, 0, c->address, SESSION_CLIENT, buffer, size, DONTCOPY);
+			skynet_send(server->ctx, 0, c->address, PTYPE_CLIENT | PTYPE_TAG_DONTCOPY, 0, buffer, size);
 			buffer = NULL;
 		}
 	}
 }
 
 static int
-_main(struct skynet_context * ctx, void * ud, int session, uint32_t source, const void * msg, size_t sz) {
-	if (msg == NULL) {
+_main(struct skynet_context * ctx, void * ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
+	if (type == PTYPE_RESPONSE) {
 		_poll(ud);
 		return 0;
 	}
+	assert(type == PTYPE_TEXT);
 	const char * param = (const char *)msg + 4;
 	if (memcmp(msg, "ADD ", 4)==0) {
 		char * endptr;
diff --git a/gate/main.c b/gate/main.c
index 1c1fa3a9..ff284372 100644
--- a/gate/main.c
+++ b/gate/main.c
@@ -24,6 +24,7 @@ struct gate {
 	int id_index;
 	int cap;
 	int max_connection;
+	int client_tag;
 	struct connection ** agent;
 	struct connection * map;
 };
@@ -124,24 +125,23 @@ _report(struct gate *g, struct skynet_context * ctx, const char * data, ...) {
 	int n = vsnprintf(tmp, sizeof(tmp), data, ap);
 	va_end(ap);
 
-	skynet_send(ctx, 0, g->watchdog, 0, tmp, n, 0);
+	skynet_send(ctx, 0, g->watchdog, PTYPE_TEXT,  0, tmp, n);
 }
 
 static void
 _forward(struct skynet_context * ctx,struct gate *g, int uid, void * data, size_t len) {
 	if (g->broker) {
-		skynet_send(ctx, 0, g->broker, SESSION_CLIENT, data, len, 0);
+		skynet_send(ctx, 0, g->broker, g->client_tag, 0, data, len);
 		return;
 	}
 	struct connection * agent = _id_to_agent(g,uid);
 	if (agent->agent) {
-		// client package has not session , send 0x7fffffff
-		skynet_send(ctx, agent->client, agent->agent, SESSION_CLIENT, data, len, 0);
+		skynet_send(ctx, agent->client, agent->agent, g->client_tag, 0 , data, len);
 	} else if (g->watchdog) {
 		char * tmp = malloc(len + 32);
 		int n = snprintf(tmp,len+32,"%d data ",uid);
 		memcpy(tmp+n,data,len);
-		skynet_send(ctx, 0, g->watchdog, 0, tmp, len + n, DONTCOPY);
+		skynet_send(ctx, 0, g->watchdog, PTYPE_TEXT | PTYPE_TAG_DONTCOPY, 0, tmp, len + n);
 	}
 }
 
@@ -172,12 +172,13 @@ _remove_id(struct gate *g, int uid) {
 }
 
 static int
-_cb(struct skynet_context * ctx, void * ud, int session, uint32_t source, const void * msg, size_t sz) {
+_cb(struct skynet_context * ctx, void * ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
 	struct gate *g = ud;
-	if (msg) {
+	if (type == PTYPE_TEXT) {
 		_ctrl(ctx, g , msg , (int)sz);
 		return 0;
 	}
+	assert(type == PTYPE_RESPONSE);
 	struct mread_pool * m = g->pool;
 	int connection_id = mread_poll(m,100);	// timeout : 100ms
 	if (connection_id < 0) {
@@ -228,11 +229,15 @@ gate_init(struct gate *g , struct skynet_context * ctx, char * parm) {
 	int sz = strlen(parm)+1;
 	char watchdog[sz];
 	char binding[sz];
-	int n = sscanf(parm, "%s %s %d %d",watchdog, binding,&max,&buffer);
-	if (n!=4) {
+	int client_tag = 0;
+	int n = sscanf(parm, "%s %s %d %d %d",watchdog, binding,&client_tag , &max,&buffer);
+	if (n<3) {
 		skynet_error(ctx, "Invalid gate parm %s",parm);
 		return 1;
 	}
+	if (client_tag == 0) {
+		client_tag = PTYPE_CLIENT;
+	}
 	char * portstr = strchr(binding,':');
 	uint32_t addr = INADDR_ANY;
 	if (portstr == NULL) {
@@ -273,6 +278,7 @@ gate_init(struct gate *g , struct skynet_context * ctx, char * parm) {
 	g->cap = cap;
 	g->max_connection = max;
 	g->id_index = 0;
+	g->client_tag = client_tag;
 
 	g->agent = malloc(cap * sizeof(struct connection *));
 	memset(g->agent, 0, cap * sizeof(struct connection *));
diff --git a/lualib-src/lua-skynet.c b/lualib-src/lua-skynet.c
index d19c8181..a2a0ffcb 100644
--- a/lualib-src/lua-skynet.c
+++ b/lualib-src/lua-skynet.c
@@ -8,7 +8,7 @@
 #include <assert.h>
 
 static int
-_cb(struct skynet_context * context, void * ud, int session, uint32_t source, const void * msg, size_t sz) {
+_cb(struct skynet_context * context, void * ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
 	lua_State *L = ud;
 	int trace = 1;
 	int top = lua_gettop(L);
@@ -19,23 +19,13 @@ _cb(struct skynet_context * context, void * ud, int session, uint32_t source, co
 		lua_pushvalue(L,2);
 	}
 
-	int r;
-	if (msg == NULL) {
-		if (source == 0) {
-			lua_pushinteger(L, session);
-			r = lua_pcall(L, 1, 0 , trace);
-		} else {
-			lua_pushinteger(L, session);
-			lua_pushnumber(L, source);
-			r = lua_pcall(L, 2, 0 , trace);
-		}
-	} else {
-		lua_pushinteger(L, session);
-		lua_pushnumber(L, source);
-		lua_pushlightuserdata(L,(void *)msg);
-		lua_pushinteger(L,sz);
-		r = lua_pcall(L, 4, 0 , trace);
-	}
+	lua_pushinteger(L, type);
+	lua_pushlightuserdata(L, (void *)msg);
+	lua_pushinteger(L,sz);
+	lua_pushinteger(L, session);
+	lua_pushnumber(L, source);
+
+	int r = lua_pcall(L, 5, 0 , trace);
 	if (r == LUA_OK) 
 		return 0;
 	const char * self = skynet_command(context, "REG", NULL);
@@ -98,45 +88,60 @@ _command(lua_State *L) {
 static int
 _genid(lua_State *L) {
 	struct skynet_context * context = lua_touserdata(L, lua_upvalueindex(1));
-	int session = skynet_send(context, 0, 0, -1, NULL, 0 , 0);
+	int session = skynet_send(context, 0, 0, PTYPE_TAG_ALLOCSESSION , 0 , NULL, 0);
 	lua_pushinteger(L, session);
 	return 1;
 }
 
+// copy from _send
+
 static int
 _sendname(lua_State *L, struct skynet_context * context, const char * dest) {
+	int type = luaL_checkinteger(L, 2);
 	int session = 0;
-	int index = 0;
-
-	if (lua_type(L,2) == LUA_TNUMBER) {
-		session = lua_tointeger(L,2);
-		++index;
-	}
-	if (lua_gettop(L) == index + 1) {
-		session = skynet_sendname(context, dest, session , NULL, 0, 0);
+	if (lua_isnil(L,3)) {
+		type |= PTYPE_TAG_ALLOCSESSION;
 	} else {
-		int type = lua_type(L,index+2);
-		if (type == LUA_TSTRING) {
-			size_t len = 0;
-			void * msg = (void *)lua_tolstring(L,index+2,&len);
-			session = skynet_sendname(context, dest, session , msg, len, 0);
-		} else if (type == LUA_TNIL) {
-			session = skynet_sendname(context, dest, session , NULL, 0, 0);
-		} else {
-			luaL_checktype(L,index+2, LUA_TLIGHTUSERDATA);
-			void * msg = lua_touserdata(L,index+2);
-			int size = luaL_checkinteger(L,index+3);
-			session = skynet_sendname(context, dest, session, msg, size, DONTCOPY);
-		}
+		session = luaL_checkinteger(L,3);
+	}
+
+	int mtype = lua_type(L,4);
+	switch (mtype) {
+	case LUA_TSTRING: {
+		size_t len = 0;
+		void * msg = (void *)lua_tolstring(L,4,&len);
+		session = skynet_sendname(context, dest, type, session , msg, len);
+		break;
+	}
+	case LUA_TNIL :
+		session = skynet_sendname(context, dest, type, session , NULL, 0);
+		break;
+	case LUA_TLIGHTUSERDATA: {
+		luaL_checktype(L, 4, LUA_TLIGHTUSERDATA);
+		void * msg = lua_touserdata(L,4);
+		int size = luaL_checkinteger(L,5);
+		session = skynet_sendname(context, dest, type | PTYPE_TAG_DONTCOPY, session, msg, size);
+		break;
+	}
+	default:
+		luaL_error(L, "skynet.send invalid param %s", lua_type(L,4));
 	}
 	lua_pushinteger(L,session);
 	return 1;
 }
 
+/*
+	unsigned address
+	 string address
+	integer type
+	integer session
+	string message
+	 lightuserdata message_ptr
+	 integer len
+ */
 static int
 _send(lua_State *L) {
 	struct skynet_context * context = lua_touserdata(L, lua_upvalueindex(1));
-	int session = 0;
 	int addr_type = lua_type(L,1);
 	uint32_t dest = 0;
 	switch(addr_type) {
@@ -159,30 +164,33 @@ _send(lua_State *L) {
 		return luaL_error(L, "address must be number or string, got %s",lua_typename(L,addr_type));
 	}
 
-	int index = 0;
-	if (lua_type(L,2) == LUA_TNUMBER) {
-		session = lua_tointeger(L,2);
-		++index;
-	}
-	if (lua_gettop(L) == index + 1) {
-		session = skynet_send(context, 0, dest, session , NULL, 0, 0);
+	int type = luaL_checkinteger(L, 2);
+	int session = 0;
+	if (lua_isnil(L,3)) {
+		type |= PTYPE_TAG_ALLOCSESSION;
 	} else {
-		int type = lua_type(L,index+2);
-		if (type == LUA_TSTRING) {
-			size_t len = 0;
-			void * msg = (void *)lua_tolstring(L,index+2,&len);
-			session = skynet_send(context, 0, dest, session , msg, len, 0);
-		} else if (type == LUA_TNIL) {
-			session = skynet_send(context, 0, dest, session , NULL, 0, 0);
-		} else {
-			luaL_checktype(L,index+2, LUA_TLIGHTUSERDATA);
-			void * msg = lua_touserdata(L,index+2);
-			int size = luaL_checkinteger(L,index+3);
-			session = skynet_send(context, 0, dest, session, msg, size, DONTCOPY);
-		}
+		session = luaL_checkinteger(L,3);
 	}
-	if (session < 0) {
-		return luaL_error(L, "skynet.send drop the message to %s", dest);
+
+	int mtype = lua_type(L,4);
+	switch (mtype) {
+	case LUA_TSTRING: {
+		size_t len = 0;
+		void * msg = (void *)lua_tolstring(L,4,&len);
+		if (len == 0) {
+			msg = NULL;
+		}
+		session = skynet_send(context, 0, dest, type, session , msg, len);
+		break;
+	}
+	case LUA_TLIGHTUSERDATA: {
+		void * msg = lua_touserdata(L,4);
+		int size = luaL_checkinteger(L,5);
+		session = skynet_send(context, 0, dest, type | PTYPE_TAG_DONTCOPY, session, msg, size);
+		break;
+	}
+	default:
+		luaL_error(L, "skynet.send invalid param %s", lua_type(L,4));
 	}
 	lua_pushinteger(L,session);
 	return 1;
@@ -193,26 +201,29 @@ _redirect(lua_State *L) {
 	struct skynet_context * context = lua_touserdata(L, lua_upvalueindex(1));
 	uint32_t dest = luaL_checkunsigned(L,1);
 	uint32_t source = luaL_checkunsigned(L,2);
-	int session = luaL_checkinteger(L,3);
+	int type = luaL_checkinteger(L,3);
+	int session = luaL_checkinteger(L,4);
 
-	if (lua_gettop(L) == 3) {
-		session = skynet_send(context, source, dest, session , NULL, 0, 0);
-	} else {
-		int type = lua_type(L,4);
-		if (type == LUA_TSTRING) {
-			size_t len = 0;
-			void * msg = (void *)lua_tolstring(L,4,&len);
-			skynet_send(context, source, dest, session , msg, len, 0);
-		} else if (type == LUA_TNIL) {
-			session = skynet_send(context, source, dest, session , NULL, 0, 0);
-		} else {
-			luaL_checktype(L, 4, LUA_TLIGHTUSERDATA);
-			void * msg = lua_touserdata(L,4);
-			int size = luaL_checkinteger(L,5);
-			skynet_send(context, source, dest, session, msg, size, DONTCOPY);
+	int mtype = lua_type(L,5);
+	switch (mtype) {
+	case LUA_TSTRING: {
+		size_t len = 0;
+		void * msg = (void *)lua_tolstring(L,5,&len);
+		if (len == 0) {
+			msg = NULL;
 		}
+		session = skynet_send(context, source, dest, type, session , msg, len);
+		break;
+	}
+	case LUA_TLIGHTUSERDATA: {
+		void * msg = lua_touserdata(L,5);
+		int size = luaL_checkinteger(L,6);
+		session = skynet_send(context, source, dest, type | PTYPE_TAG_DONTCOPY, session, msg, size);
+		break;
+	}
+	default:
+		luaL_error(L, "skynet.redirect invalid param %s", lua_type(L,5));
 	}
-
 	return 0;
 }
 
diff --git a/lualib/logger.lua b/lualib/logger.lua
index 48fbffe8..219b7692 100644
--- a/lualib/logger.lua
+++ b/lualib/logger.lua
@@ -22,7 +22,7 @@ logger.CRITICAL = 50
 logger.FATAL = 60
 
 local function log_to_disk(...)
-	Skynet.send(".lualog" , Skynet.pack(...))
+	Skynet.send(".lualog" , "lua" , ...)
 end
 
 local function dump_log_to_disk(t)
diff --git a/lualib/mcgroup.lua b/lualib/mcgroup.lua
index d7c09321..1a441d82 100644
--- a/lualib/mcgroup.lua
+++ b/lualib/mcgroup.lua
@@ -5,7 +5,7 @@ local SERVICE = "GROUPMGR"
 local group = {}
 
 function group.create()
-	return skynet.call(SERVICE, skynet.unpack, skynet.pack("NEW" , skynet.self()))
+	return skynet.call(SERVICE, "lua", "NEW" , skynet.self())
 end
 
 function group.address(id)
@@ -15,16 +15,16 @@ end
 
 function group.enter(id, handle)
 	handle = handle or skynet.self()
-	skynet.send(SERVICE, 0 , skynet.pack("ENTER", handle, id))
+	skynet.send(SERVICE, "lua" , "ENTER", handle, id)
 end
 
 function group.leave(id, handle)
 	handle = handle or skynet.self()
-	skynet.send(SERVICE, 0 , skynet.pack("LEAVE", handle, id))
+	skynet.send(SERVICE, "lua" , "LEAVE", handle, id)
 end
 
 function group.release(id)
-	skynet.send(SERVICE, 0 , skynet.pack("CLEAR", skynet.self(), id))
+	skynet.send(SERVICE, "lua" , "CLEAR", skynet.self(), id)
 end
 
 return group
\ No newline at end of file
diff --git a/lualib/redis.lua b/lualib/redis.lua
index 688b9a2d..2b06edd2 100644
--- a/lualib/redis.lua
+++ b/lualib/redis.lua
@@ -10,7 +10,7 @@ local command = {}
 setmetatable(command, { __index = function(t,k)
 	local cmd = string.upper(k)
 	local f = function(self, ...)
-		local err, result = skynet.call( self.__handle, skynet.unpack, skynet.pack(cmd, ...))
+		local err, result = skynet.call( self.__handle, "lua", cmd, ...)
 		assert(err, result)
 		return result
 	end
@@ -19,7 +19,7 @@ setmetatable(command, { __index = function(t,k)
 end})
 
 function command:exists(key)
-	local result , exists = skynet.call( self.__handle, skynet.unpack, skynet.pack("EXISTS", key))
+	local result , exists = skynet.call( self.__handle, "lua" , "EXISTS", key)
 	assert(result, exists)
 	exists = exists ~= 0
 	return exists
@@ -30,7 +30,7 @@ local meta = {
 }
 
 function redis.connect(dbname)
-	local handle = skynet.call(".redis-manager",skynet.unpack, skynet.pack(dbname))
+	local handle = skynet.call(".redis-manager", "lua", dbname)
 	assert(handle ~= nil)
 	return setmetatable({ __handle = handle } , meta)
 end
diff --git a/lualib/skynet.lua b/lualib/skynet.lua
index 01a98c02..a19fbf9d 100644
--- a/lualib/skynet.lua
+++ b/lualib/skynet.lua
@@ -5,7 +5,18 @@ local coroutine = coroutine
 local assert = assert
 local pairs = pairs
 
+local proto = {}
 local skynet = {}
+
+function skynet.register_protocol(class)
+	local name = class.name
+	local id = class.id
+	assert(proto[name] == nil)
+	assert(type(name) == "string" and type(id) == "number" and id >=0 and id <=255)
+	proto[name] = class
+	proto[id] = class
+end
+
 local session_id_coroutine = {}
 local session_coroutine_id = {}
 local session_coroutine_address = {}
@@ -41,7 +52,11 @@ function suspend(co, result, command, param, size)
 	elseif command == "RETURN" then
 		local co_session = session_coroutine_id[co]
 		local co_address = session_coroutine_address[co]
-		c.send(co_address, co_session, param, size)
+		-- PTYPE_RESPONSE = 1 , see skynet.h
+		if param == nil then
+			error(debug.traceback(co))
+		end
+		c.send(co_address, 1, co_session, param, size)
 		return suspend(co, coroutine.resume(co))
 	elseif command == nil then
 		-- coroutine exit
@@ -74,7 +89,9 @@ function skynet.sleep(ti)
 	assert(session)
 	local ret = coroutine.yield("SLEEP", tonumber(session))
 	sleep_session[coroutine.running()] = nil
-	return ret
+	if ret == true then
+		return "BREAK"
+	end
 end
 
 function skynet.yield()
@@ -136,61 +153,30 @@ function skynet.setenv(key, value)
 	c.command("SETENV",key .. " " ..value)
 end
 
-skynet.send = assert(c.send)
+function skynet.send(addr, typename, ...)
+	local p = proto[typename]
+	return c.send(addr, p.id, 0 , p.pack(...))
+end
+
 skynet.genid = assert(c.genid)
-skynet.redirect = assert(c.redirect)
+
+skynet.redirect = function(dest,source,typename,...)
+	return c.redirect(dest, source, proto[typename].id, ...)
+end
+
 skynet.pack = assert(c.pack)
-skynet.tostring = assert(c.tostring)
 skynet.unpack = assert(c.unpack)
+skynet.tostring = assert(c.tostring)
 
-function skynet.call(addr, deseri , ...)
-	if deseri == nil then
-		local session = c.send(addr, -1, ...)
-		return coroutine.yield("CALL", session)
-	end
-	local t = type(deseri)
-	if t == "function" then
-		local session = c.send(addr, -1, ...)
-		return deseri(coroutine.yield("CALL", session))
-	else
-		assert(t=="string")
-		local session = c.send(addr, -1, deseri)
-		return c.tostring(coroutine.yield("CALL", session))
-	end
+function skynet.call(addr, typename, ...)
+	local p = proto[typename]
+	local session = c.send(addr, p.id , nil , p.pack(...))
+	return p.unpack(coroutine.yield("CALL", session))
 end
 
-function skynet.ret(...)
-	coroutine.yield("RETURN", ...)
-end
-
-local function default_dispatch(f, unknown)
-	unknown = unknown or function (session, msg, sz)
-		local self = skynet.self()
-		print(self, session,msg,sz)
-		error(string.format("%s Unknown session %d", self, session))
-	end
-	return function(session, address , msg, sz)
-		if session == nil then
-			return
-		end
-		if session <= 0 then
-			session = - session
-			co = coroutine.create(f)
-			session_coroutine_id[co] = session
-			session_coroutine_address[co] = address
-			suspend(co, coroutine.resume(co, msg, sz, session, address))
-		else
-			local co = session_id_coroutine[session]
-			if co == "BREAK" then
-				session_id_coroutine[session] = nil
-			elseif co == nil then
-				unknown(session,msg,sz)
-			else
-				session_id_coroutine[session] = nil
-				suspend(co, coroutine.resume(co, msg, sz))
-			end
-		end
-	end
+function skynet.ret(msg, sz)
+	msg = msg or ""
+	coroutine.yield("RETURN", msg, sz)
 end
 
 function skynet.wakeup(co)
@@ -200,30 +186,54 @@ function skynet.wakeup(co)
 	end
 end
 
-function skynet.dispatch(f,unknown)
-	c.callback(default_dispatch(f,unknown))
+function skynet.dispatch(typename, func)
+	local p = assert(proto[typename],tostring(typename))
+	assert(p.dispatch == nil, tostring(typename))
+	p.dispatch = func
 end
 
-function skynet.filter(filter, f, unknown)
-	local func = default_dispatch(f, unknown)
-	c.callback(function (...)
-		func(filter(...))
+local function unknown_response(session, address, msg, sz)
+	print("Response message :" , c.tostring(msg,sz))
+	error(string.format("Unknown session : %d from %x", session, address))
+end
+
+function skynet.dispatch_unknown_response(unknown)
+	local prev = unknown_response
+	unknown_response = unknown
+	return prev
+end
+
+local function start_skynet()
+	c.callback(function(prototype, msg, sz, session, source)
+		-- PTYPE_RESPONSE = 1, read skynet.h
+		if prototype == 1 then
+			local co = session_id_coroutine[session]
+			if co == "BREAK" then
+				session_id_coroutine[session] = nil
+			elseif co == nil then
+				unknown_response(session, source, msg, sz)
+			else
+				session_id_coroutine[session] = nil
+				suspend(co, coroutine.resume(co, msg, sz))
+			end
+		else
+			local p = assert(proto[prototype], prototype)
+			local f = p.dispatch
+			if f then
+				local co = coroutine.create(f)
+				session_coroutine_id[co] = session
+				session_coroutine_address[co] = source
+				suspend(co, coroutine.resume(co, session,source, p.unpack(msg,sz)))
+			else
+				print("Unknown request :" , p.unpack(msg,sz))
+				error(string.format("Can't dispatch type %s : ", p.name))
+			end
+		end
 	end)
 end
 
-function skynet.start(f)
-	local session = c.command("TIMEOUT","0")
-	local co = coroutine.create(
-		function(...)
-			f(...)
-			skynet.send(".launcher",0)
-		end
-	)
-	session_id_coroutine[tonumber(session)] = co
-end
-
 function skynet.newservice(name, ...)
-	local handle = skynet.call(".launcher", skynet.unpack, skynet.pack("snlua", name, ...))
+	local handle = skynet.call(".launcher", "lua" , "snlua", name, ...)
 	return handle
 end
 
@@ -262,6 +272,8 @@ end
 ------ remote object --------
 
 do
+	-- proto is 11
+
 	local remote_query, remote_alloc, remote_bind = c.remote_init(skynet.self())
 	local weak_meta = { __mode = "kv" }
 	local meta = getmetatable(c.unpack(c.pack({ __remote = 0 })))
@@ -279,7 +291,8 @@ do
 		if f == nil then
 			f = function(...)
 				local addr = remote_query(t.__remote)
-				local session = _send(addr, -1, _pack(t,method,...))
+				-- the proto is 11 (lua is 10)
+				local session = _send(addr, 11 , nil, _pack(t,method,...))
 				local msg, sz = _yield("CALL", session)
 				return select(2,assert(_unpack(msg,sz)))
 			end
@@ -321,16 +334,59 @@ do
 		return _yield("RETURN", _pack(pcall(f,...)))
 	end
 
-	function skynet.remote_service(unknown)
-		local function f(msg,sz)
-			return remote_call(_unpack(msg,sz))
-		end
-		c.callback(default_dispatch(f,unknown))
-	end
-
 	function skynet.remote_root()
 		return skynet.remote_bind(0)
 	end
+
+	skynet.register_protocol {
+		name = "remoteobj",
+		id = 11,
+		unpack = c.unpack,
+		dispatch = function (session, source, ...)
+			remote_call(...)
+		end
+	}
+end
+
+----- register protocol
+do
+	local REG = skynet.register_protocol
+
+	REG {
+		name = "text",
+		id = 0,
+		pack = function (...)
+			local n = select ("#" , ...)
+			if n == 0 then
+				return ""
+			elseif n == 1 then
+				return tostring(...)
+			else
+				return table.concat({...}," ")
+			end
+		end,
+		unpack = c.tostring
+	}
+
+	REG {
+		name = "lua",
+		id = 10,
+		pack = skynet.pack,
+		unpack = skynet.unpack,
+	}
+
+	REG {
+		name = "response",
+		id = 1,
+	}
+end
+
+function skynet.start(f)
+	start_skynet()
+	skynet.timeout(0, function()
+		f()
+		skynet.send(".launcher","lua", nil)
+	end)
 end
 
 return skynet
diff --git a/lualib/socket.lua b/lualib/socket.lua
index 7453b162..b248f7b8 100644
--- a/lualib/socket.lua
+++ b/lualib/socket.lua
@@ -12,9 +12,7 @@ function socket.connect(addr)
 	if fd == nil then
 		return true
 	end
-	print("connect to " .. addr)
-	local command = "ADD "..fd.." ".. skynet.address(skynet.self())
-	skynet.send(".connection", command )
+	skynet.send(".connection", "text", "ADD", fd , skynet.address(skynet.self()))
 	object = c.new()
 end
 
@@ -47,7 +45,7 @@ end
 function socket.close()
 	if fd then
 		c.close(fd)
-		skynet.send(".connection","DEL "..fd)
+		skynet.send(".connection","text", "DEL", fd)
 		fd = nil
 	end
 end
diff --git a/service-src/service_client.c b/service-src/service_client.c
index b4b6c929..08f61215 100644
--- a/service-src/service_client.c
+++ b/service-src/service_client.c
@@ -9,7 +9,7 @@
 #include <string.h>
 
 static int
-_cb(struct skynet_context * context, void * ud, int session, uint32_t source, const void * msg, size_t sz) {
+_cb(struct skynet_context * context, void * ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
 	assert(sz <= 65535);
 	int fd = (int)(intptr_t)ud;
 
diff --git a/service-src/service_harbor.c b/service-src/service_harbor.c
index 6bc7ead8..5089d548 100644
--- a/service-src/service_harbor.c
+++ b/service-src/service_harbor.c
@@ -40,6 +40,10 @@ struct hashmap {
 	struct keyvalue *node[HASH_SIZE];
 };
 
+/*
+	message type (8bits) is in destination high 8bits
+	harbor id (8bits) is also in that place , but  remote message doesn't need harbor id.
+ */
 struct remote_message_header {
 	uint32_t source;
 	uint32_t destination;
@@ -354,7 +358,7 @@ _dispatch_queue(struct harbor *h, struct skynet_context * context, struct msg_qu
 	struct msg * m = _pop_queue(queue);
 	while (m) {
 		struct remote_message_header * cookie = (struct remote_message_header *)(m->buffer + m->size - sizeof(*cookie));
-		cookie->destination = handle;
+		cookie->destination |= (handle & 0xffffff);
 		_header_to_message(cookie, (uint32_t *)cookie);
 		int err = _send_package(fd, m->buffer, m->size);
 		if (err) {
@@ -411,12 +415,12 @@ _request_master(struct harbor *h, struct skynet_context * context, const char na
  */
 
 static int
-_remote_send_handle(struct harbor *h, struct skynet_context * context, uint32_t source, uint32_t destination, int session, const char * msg, size_t sz) {
+_remote_send_handle(struct harbor *h, struct skynet_context * context, uint32_t source, uint32_t destination, int type, int session, const char * msg, size_t sz) {
 	int harbor_id = destination >> HANDLE_REMOTE_SHIFT;
 	assert(harbor_id != 0);
 	if (harbor_id == h->id) {
 		// local message
-		skynet_send(context, source, destination , session, (void *)msg, sz, DONTCOPY);
+		skynet_send(context, source, destination , type | PTYPE_TAG_DONTCOPY, session, (void *)msg, sz);
 		return 1;
 	}
 
@@ -424,7 +428,7 @@ _remote_send_handle(struct harbor *h, struct skynet_context * context, uint32_t
 	if (fd >= 0) {
 		struct remote_message_header cookie;
 		cookie.source = source;
-		cookie.destination = destination;
+		cookie.destination = (destination & 0xffffff) | ((uint32_t)type << 24);
 		cookie.session = (uint32_t)session;
 		int err = _send_remote(fd, msg,sz,&cookie);
 		if (err) {
@@ -456,7 +460,7 @@ _remote_register_name(struct harbor *h, struct skynet_context * context, const c
 }
 
 static int
-_remote_send_name(struct harbor *h, struct skynet_context * context, uint32_t source, const char name[GLOBALNAME_LENGTH], int session, const char * msg, size_t sz) {
+_remote_send_name(struct harbor *h, struct skynet_context * context, uint32_t source, const char name[GLOBALNAME_LENGTH], int type, int session, const char * msg, size_t sz) {
 	struct keyvalue * node = _hash_search(h->map, name);
 	if (node == NULL) {
 		node = _hash_insert(h->map, name);
@@ -467,14 +471,14 @@ _remote_send_name(struct harbor *h, struct skynet_context * context, uint32_t so
 		}
 		struct remote_message_header header;
 		header.source = source;
-		header.destination = 0;
+		header.destination = type << 24;
 		header.session = (uint32_t)session;
 		_push_queue(node->queue, msg, sz, &header);
 		// 0 for request
 		_remote_register_name(h, context, name, 0);
 		return 1;
 	} else {
-		return _remote_send_handle(h, context, source, node->value, session, msg, sz);
+		return _remote_send_handle(h, context, source, node->value, type, session, msg, sz);
 	}
 }
 
@@ -485,9 +489,11 @@ _report_local_address(struct harbor *h, struct skynet_context * context, const c
 }
 
 static int
-_mainloop(struct skynet_context * context, void * ud, int session, uint32_t source, const void * msg, size_t sz) {
+_mainloop(struct skynet_context * context, void * ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
 	struct harbor * h = ud;
-	if (session == SESSION_CLIENT) {
+	switch (type) {
+	case PTYPE_HARBOR: {
+		// remote message in
 		const char * cookie = msg;
 		cookie += sz - 12;
 		struct remote_message_header header;
@@ -511,28 +517,37 @@ _mainloop(struct skynet_context * context, void * ud, int session, uint32_t sour
 				_update_remote_name(h, context, msg, header.destination);
 			}
 		} else {
-			skynet_send(context, header.source, header.destination, (int)header.session, (void *)msg, sz-12, DONTCOPY);
+			uint32_t destination = header.destination;
+			int type = (destination >> 24) | PTYPE_TAG_DONTCOPY;
+			destination = (destination & 0xffffff) | ((uint32_t)h->id << 24);
+			skynet_send(context, header.source, destination, type, (int)header.session, (void *)msg, sz-12);
 			return 1;
 		}
-	} else {
+		return 0;
+	}
+	case PTYPE_SYSTEM: {
+		// register name message
+		const struct remote_message *rmsg = msg;
+		assert (sz == sizeof(rmsg->destination));
+		_remote_register_name(h, context, rmsg->destination.name, rmsg->destination.handle);
+		return 0;
+	}
+	default: {
+		// remote message out
 		const struct remote_message *rmsg = msg;
-		if (sz == sizeof(rmsg->destination)) {
-			_remote_register_name(h, context, rmsg->destination.name, rmsg->destination.handle);
-			return 0;
-		}
-		assert(sz == sizeof(*rmsg));
 		if (rmsg->destination.handle == 0) {
-			if (_remote_send_name(h, context, source , rmsg->destination.name, session, rmsg->message, rmsg->sz)) {
+			if (_remote_send_name(h, context, source , rmsg->destination.name, type, session, rmsg->message, rmsg->sz)) {
 				return 0;
 			}
 		} else {
-			if (_remote_send_handle(h, context, source , rmsg->destination.handle, session, rmsg->message, rmsg->sz)) {
+			if (_remote_send_handle(h, context, source , rmsg->destination.handle, type, session, rmsg->message, rmsg->sz)) {
 				return 0;
 			}
 		}
 		free((void *)rmsg->message);
+		return 0;
+	}
 	}
-	return 0;
 }
 
 int
@@ -553,7 +568,7 @@ harbor_init(struct harbor *h, struct skynet_context *ctx, const char * args) {
 	h->master_fd = master_fd;
 
 	char tmp[128];
-	sprintf(tmp,"gate ! %s %d 0",local_addr,REMOTE_MAX);
+	sprintf(tmp,"gate ! %s %d %d 0",local_addr, PTYPE_HARBOR, REMOTE_MAX);
 	const char * gate_addr = skynet_command(ctx, "LAUNCH", tmp);
 	if (gate_addr == NULL) {
 		skynet_error(ctx, "Harbor : launch gate failed");
@@ -566,8 +581,8 @@ harbor_init(struct harbor *h, struct skynet_context *ctx, const char * args) {
 	}
 	const char * self_addr = skynet_command(ctx, "REG", NULL);
 	int n = sprintf(tmp,"broker %s",self_addr);
-	skynet_send(ctx, 0, gate, 0, tmp, n, 0);
-	skynet_send(ctx, 0, gate, 0, "start", 5, 0);
+	skynet_send(ctx, 0, gate, PTYPE_TEXT, 0, tmp, n);
+	skynet_send(ctx, 0, gate, PTYPE_TEXT, 0, "start", 5);
 
 	h->id = harbor_id;
 	skynet_callback(ctx, h, _mainloop);
diff --git a/service-src/service_master.c b/service-src/service_master.c
index a6120555..09dc0749 100644
--- a/service-src/service_master.c
+++ b/service-src/service_master.c
@@ -242,9 +242,12 @@ _update_address(struct skynet_context * context, struct master *m, int harbor_id
  */
 
 static int
-_mainloop(struct skynet_context * context, void * ud, int session, uint32_t source, const void * msg, size_t sz) {
+_mainloop(struct skynet_context * context, void * ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
+	if (type != PTYPE_HARBOR) {
+		skynet_error(context, "None harbor message recv from %x (type = %d)", source, type);
+		return 0;
+	}
 	struct master *m = ud;
-	assert(session == SESSION_CLIENT);
 	uint32_t handle = 0;
 	memcpy(&handle, msg, 4);
 	handle = ntohl(handle);
@@ -266,7 +269,7 @@ _mainloop(struct skynet_context * context, void * ud, int session, uint32_t sour
 int
 master_init(struct master *m, struct skynet_context *ctx, const char * args) {
 	char tmp[strlen(args) + 32];
-	sprintf(tmp,"gate ! %s %d 0",args,REMOTE_MAX);
+	sprintf(tmp,"gate ! %s %d %d 0",args,PTYPE_HARBOR,REMOTE_MAX);
 	const char * gate_addr = skynet_command(ctx, "LAUNCH", tmp);
 	if (gate_addr == NULL) {
 		skynet_error(ctx, "Master : launch gate failed");
@@ -279,8 +282,8 @@ master_init(struct master *m, struct skynet_context *ctx, const char * args) {
 	}
 	const char * self_addr = skynet_command(ctx, "REG", NULL);
 	int n = sprintf(tmp,"broker %s",self_addr);
-	skynet_send(ctx, 0, gate, 0, tmp, n, 0);
-	skynet_send(ctx, 0, gate, 0, "start", 5, 0);
+	skynet_send(ctx, 0, gate, PTYPE_TEXT, 0, tmp, n);
+	skynet_send(ctx, 0, gate, PTYPE_TEXT, 0, "start", 5);
 
 	skynet_callback(ctx, m, _mainloop);
 
diff --git a/service-src/service_multicast.c b/service-src/service_multicast.c
index a2155935..c2941acd 100644
--- a/service-src/service_multicast.c
+++ b/service-src/service_multicast.c
@@ -16,9 +16,9 @@ multicast_release(struct skynet_multicast_group *g) {
 }
 
 static int
-_maincb(struct skynet_context * context, void * ud, int session, uint32_t source, const void * msg, size_t sz) {
+_maincb(struct skynet_context * context, void * ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
 	struct skynet_multicast_group *g = ud;
-	if (source == 0) {
+	if (type == PTYPE_SYSTEM) {
 		char cmd = '\0';
 		uint32_t handle = 0;
 		sscanf(msg,"%c %x",&cmd,&handle);
@@ -42,6 +42,7 @@ _maincb(struct skynet_context * context, void * ud, int session, uint32_t source
 		}
 		return 0;		
 	} else {
+		sz |= type << 24;
 		struct skynet_multicast_message * mc = skynet_multicast_create(msg, sz, source);
 		skynet_multicast_castgroup(context, g, mc);
 		return 1;
diff --git a/service-src/service_tunnel.c b/service-src/service_tunnel.c
index 9fb6a92d..c2aae7fb 100644
--- a/service-src/service_tunnel.c
+++ b/service-src/service_tunnel.c
@@ -2,7 +2,7 @@
 #include <stdio.h>
 
 static int
-_cb(struct skynet_context * context, void * ud, int session, uint32_t source, const void * msg, size_t sz) {
+_cb(struct skynet_context * context, void * ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
 	uint32_t dest = (uint32_t)(uintptr_t)ud;
 	skynet_forward(context, dest);
 	return 0;
diff --git a/service/agent.lua b/service/agent.lua
index ba5bdfab..e51e0d04 100644
--- a/service/agent.lua
+++ b/service/agent.lua
@@ -1,23 +1,19 @@
 local skynet = require "skynet"
 local client = ...
 
-local session_id = 0
-skynet.filter(function (session, address , msg, sz)
-	if session == 0x7fffffff then
-		skynet.send("LOG", "client message :" .. skynet.tostring(msg,sz))
+skynet.register_protocol {
+	name = "client",
+	id = 3,
+	pack = function(...) return ... end,
+	unpack = skynet.tostring,
+	dispatch = function (session, address, text)
 		-- It's client, there is no session
-		session_id = session_id + 1
-		session = - session_id
-	else
-		skynet.send("LOG", "skynet message")
+		skynet.send("LOG", "text", "client message :" .. text)
+		local result = skynet.call("SIMPLEDB", "text", text)
+		skynet.ret(result)
 	end
-	return session, address , msg, sz
-end, function (msg,sz)
-	local message = skynet.tostring(msg,sz)
-	local result = skynet.call("SIMPLEDB",message)
-	skynet.ret(result)
-end)
+}
 
 skynet.start(function()
-	skynet.send(client,"Welcome to skynet")
+	skynet.send(client,"text","Welcome to skynet")
 end)
diff --git a/service/console.lua b/service/console.lua
index 70e22b12..95c3d5a2 100644
--- a/service/console.lua
+++ b/service/console.lua
@@ -1,7 +1,5 @@
 local skynet = require "skynet"
 
-skynet.dispatch()
-
 skynet.start(function()
 	while true do
 		local cmd = io.read()
diff --git a/service/globallog.lua b/service/globallog.lua
index f506b6e4..ec431cce 100644
--- a/service/globallog.lua
+++ b/service/globallog.lua
@@ -1,8 +1,8 @@
 local skynet = require "skynet"
 
-skynet.dispatch(function(msg, sz , session , from)
-	local message = skynet.tostring(msg,sz)
-	print("[GLOBALLOG]", skynet.address(from),message)
+skynet.start(function()
+	skynet.dispatch("text", function(session, address, text)
+		print("[GLOBALLOG]", skynet.address(address),text)
+	end)
+	skynet.register "LOG"
 end)
-
-skynet.register "LOG"
\ No newline at end of file
diff --git a/service/group_agent.lua b/service/group_agent.lua
index 3dcfa84b..386a7785 100644
--- a/service/group_agent.lua
+++ b/service/group_agent.lua
@@ -46,13 +46,11 @@ function command.CLEAR(id)
 	end
 end
 
-skynet.dispatch(function (msg,sz)
-	local cmd , id , handle = skynet.unpack(msg,sz)
-	local f = command[cmd]
-	assert(f, cmd)
-	f(id,handle)
-end)
-
 skynet.start(function()
-	skynet.send("GROUPMGR" , 0, skynet.pack("MASTER", skynet.self()))
+	skynet.dispatch("lua", function(session, address, cmd , id , handle)
+		local f = command[cmd]
+		assert(f, cmd)
+		f(id,handle)
+	end)
+	skynet.send("GROUPMGR" , "lua", "MASTER", skynet.self())
 end)
diff --git a/service/group_mgr.lua b/service/group_mgr.lua
index 34e2e68c..ba6b9bd1 100644
--- a/service/group_mgr.lua
+++ b/service/group_mgr.lua
@@ -12,13 +12,13 @@ end
 local function create_group_in(harbor, id)
 	local local_ctrl = assert(harbor_ctrl[harbor])
 	local g = multicast[id]
-	local local_mc = skynet.call(local_ctrl, skynet.unpack, skynet.pack("CREATE", id))
+	local local_mc = skynet.call(local_ctrl, "lua", "CREATE", id)
 	for _,mc in pairs(g) do
-		skynet.send(local_ctrl, 0, skynet.pack("AGENT", id, mc))
+		skynet.send(local_ctrl, "lua", "AGENT", id, mc)
 	end
 	for harbor_id,ctrl in pairs(harbor_ctrl) do
 		if harbor_id ~= harbor then
-			skynet.send(ctrl,0, skynet.pack("AGENT", id, local_mc))
+			skynet.send(ctrl, "lua", "AGENT", id, local_mc)
 		end
 	end
 	g[harbor] = local_mc
@@ -38,14 +38,14 @@ function command.ENTER(address, harbor, id)
 	end
 	local local_ctrl = assert(harbor_ctrl[harbor])
 
-	skynet.send(local_ctrl, 0, skynet.pack("ENTER", id, address))
+	skynet.send(local_ctrl, "lua", "ENTER", id, address)
 end
 
 function command.LEAVE(address, harbor, id)
 	local g = multicast[id]
 	assert(g,id)
 	local local_ctrl = assert(harbor_ctrl[harbor])
-	skynet.send(local_ctrl, 0, skynet.pack("LEAVE", id, address))
+	skynet.send(local_ctrl, "lua", "LEAVE", id, address)
 end
 
 function command.DELETE(_,_, id)
@@ -54,16 +54,17 @@ function command.DELETE(_,_, id)
 	multicast[id] = nil
 
 	for harbor_id,_ in pairs(g) do
-		skynet.send(harbor_ctrl[harbor_id],0, skynet.pack("CLEAR", id))
+		skynet.send(harbor_ctrl[harbor_id], "lua", "CLEAR", id)
 	end
 end
 
-skynet.dispatch(function (msg,sz)
-	local cmd , address , param = skynet.unpack(msg,sz)
-	local f = command[cmd]
-	assert(f, cmd, param)
-	local harbor = skynet.harbor(address)
-	f(address, harbor, param)
+skynet.start(function()
+	skynet.dispatch("lua", function(_, _, cmd , address, param)
+		local f = command[cmd]
+		assert(f, cmd, param)
+		local harbor = skynet.harbor(address)
+		f(address, harbor, param)
+	end)
+	skynet.register("GROUPMGR")
 end)
 
-skynet.register("GROUPMGR")
\ No newline at end of file
diff --git a/service/launcher.lua b/service/launcher.lua
index ca42d2fa..8af6cc59 100644
--- a/service/launcher.lua
+++ b/service/launcher.lua
@@ -3,28 +3,26 @@ local string = string
 
 local instance = {}
 
-local function _extract( service, ...)
-	return service , table.concat({...}, " ")
-end
+skynet.register(".launcher")
 
-skynet.dispatch(function(msg, sz , session, address)
-	if session == 0 then
-		-- init notice
-		local reply = instance[address]
-		if reply then
-			skynet.send(reply[2] , reply[1], skynet.pack(address))
-			instance[address] = nil
-		end
-	else
-		-- launch request
-		local service , param = _extract(skynet.unpack(msg,sz))
-		local inst = skynet.launch(service, param)
-		if inst then
-			instance[inst] = { session, address }
+skynet.start(function()
+	skynet.dispatch("lua" , function(session, address , service, ...)
+		if service == nil then
+			-- init notice
+			local reply = instance[address]
+			if reply then
+				skynet.redirect(reply.address , 0, "response", reply.session, skynet.pack(address))
+				instance[address] = nil
+			end
 		else
-			skynet.send(address, session, skynet.pack(nil))
+			-- launch request
+			local param =  table.concat({...}, " ")
+			local inst = skynet.launch(service, param)
+			if inst then
+				instance[inst] = { session = session, address = address }
+			else
+				skynet.ret(skynet.pack(nil))
+			end
 		end
-	end
+	end)
 end)
-
-skynet.register(".launcher")
\ No newline at end of file
diff --git a/service/lualog.lua b/service/lualog.lua
index 1e60a957..be323a13 100644
--- a/service/lualog.lua
+++ b/service/lualog.lua
@@ -37,8 +37,9 @@ local function log(name, modname, level, timestamp, msg, src, tags)
 	})
 end
 
-skynet.dispatch(function(msg, sz , session , from)
-	log(skynet.unpack(msg,sz))
+skynet.start(function()
+	skynet.dispatch("lua",function(session, from, ...)
+		log(...)
+	end)
+	skynet.register ".lualog"
 end)
-
-skynet.register ".lualog"
\ No newline at end of file
diff --git a/service/main.lua b/service/main.lua
index a1951b8f..c67b0d4a 100644
--- a/service/main.lua
+++ b/service/main.lua
@@ -1,11 +1,9 @@
 local skynet = require "skynet"
 
-skynet.dispatch()
-
 skynet.start(function()
 	print("Server start")
-	local lualog = skynet.launch("snlua","lualog")
 	local launcher = skynet.launch("snlua","launcher")
+	local lualog = skynet.launch("snlua","lualog")
 	local group_mgr = skynet.launch("snlua", "group_mgr")
 	local group_agent = skynet.launch("snlua", "group_agent")
 	local remoteroot = skynet.launch("snlua","remote_root")
@@ -15,5 +13,6 @@ skynet.start(function()
 	local connection = skynet.launch("connection","256")
 	local redis = skynet.launch("snlua","redis-mgr")
 --	skynet.launch("snlua","testgroup")
+
 	skynet.exit()
 end)
diff --git a/service/main_log.lua b/service/main_log.lua
index 4b98a112..b4243aa9 100644
--- a/service/main_log.lua
+++ b/service/main_log.lua
@@ -1,11 +1,9 @@
 local skynet = require "skynet"
 
-skynet.dispatch()
-
 skynet.start(function()
 	print("Log server start")
-	local lualog = skynet.launch("snlua","lualog")
 	local launcher = skynet.launch("snlua","launcher")
+	local lualog = skynet.launch("snlua","lualog")
 	local group_agent = skynet.launch("snlua", "group_agent")
 	local console = skynet.launch("snlua","console")
 	local log = skynet.launch("snlua","globallog")
diff --git a/service/redis-cli.lua b/service/redis-cli.lua
index 83ad42ec..4fedad27 100644
--- a/service/redis-cli.lua
+++ b/service/redis-cli.lua
@@ -27,7 +27,7 @@ local function compose_message(msg)
 end
 
 local function select_db(id)
-	local result , ok = skynet.call(skynet.self(), skynet.unpack, skynet.pack("SELECT", tostring(id)))
+	local result , ok = skynet.call(skynet.self(), "lua", "SELECT", tostring(id))
 	assert(result and ok == "OK")
 end
 
@@ -48,7 +48,7 @@ end
 
 local function response(...)
 	local reply = pop_request_queue()
-	skynet.send(reply[2],reply[1],skynet.pack(...))
+	skynet.redirect(reply.address,0, "response", reply.session, skynet.pack(...))
 end
 
 local function readline(sep)
@@ -143,24 +143,28 @@ local function reconnect()
 	split_co = coroutine.create(split_package)
 end
 
-skynet.filter(
-	function(session, address , msg, sz)
-		if session == 0x7fffffff then
-			if msg == nil then
-				skynet.timeout(0, reconnect)
-				return
-			end
-			socket.push(msg,sz)
-			coroutine.resume(split_co)
-		elseif session < 0 then
-			local message = { skynet.unpack(msg,sz) }
-			local cmd = compose_message(message)
-			socket.write(cmd)
-			push_request_queue { -session , address, cmd }
-		else
-			return session, address, msg , sz
+skynet.register_protocol {
+	name = "client",
+	id = 3,
+	pack = function(...) return ... end,
+	unpack = function(msg,sz)
+		if msg == nil then
+			skynet.timeout(0, reconnect)
+			return
 		end
-	end
-)
+		socket.push(msg,sz)
+		assert(coroutine.resume(split_co))
+	end,
+	dispatch = function () end
+}
+
+skynet.start(function()
+	skynet.dispatch("lua", function(session, address, ...)
+		local message = { ... }
+		local cmd = compose_message(message)
+		socket.write(cmd)
+		push_request_queue { session = session , address = address, cmd = cmd }
+	end)
+	init()
+end)
 
-skynet.start(init)
diff --git a/service/redis-mgr.lua b/service/redis-mgr.lua
index 6ce98fce..a0385947 100644
--- a/service/redis-mgr.lua
+++ b/service/redis-mgr.lua
@@ -6,21 +6,22 @@ local redis_conf = skynet.getenv "redis"
 local name = config (redis_conf)
 local connection = {}
 
-skynet.dispatch(function(msg, sz , session, from)
-	local dbname = skynet.unpack(msg,sz)
-	if connection[dbname] then
-		skynet.ret(skynet.pack(connection[dbname]))
-		return
-	end
-	if name[dbname] == nil then
-		log.Error("Invalid db name : "..dbname)
-		skynet.ret(skynet.pack(nil))
-		return
-	end
+skynet.start(function()
+	skynet.dispatch("lua", function (session, from, dbname)
+		if connection[dbname] then
+			skynet.ret(skynet.pack(connection[dbname]))
+			return
+		end
+		if name[dbname] == nil then
+			log.Error("Invalid db name : "..dbname)
+			skynet.ret(skynet.pack(nil))
+			return
+		end
 
-	local redis_cli = skynet.launch("snlua", "redis-cli", name[dbname])
-	connection[dbname] = redis_cli
-	skynet.ret(skynet.pack(redis_cli))
+		local redis_cli = skynet.launch("snlua", "redis-cli", name[dbname])
+		connection[dbname] = redis_cli
+		skynet.ret(skynet.pack(redis_cli))
+	end)
+	skynet.register ".redis-manager"
 end)
 
-skynet.register ".redis-manager"
diff --git a/service/remote_root.lua b/service/remote_root.lua
index 413157f2..dcbfc2b3 100644
--- a/service/remote_root.lua
+++ b/service/remote_root.lua
@@ -17,4 +17,5 @@ end
 
 skynet.remote_create(root,0)
 
-skynet.remote_service()
\ No newline at end of file
+skynet.start(function() end)
+
diff --git a/service/simpledb.lua b/service/simpledb.lua
index 9a8be1d1..ff2f912c 100644
--- a/service/simpledb.lua
+++ b/service/simpledb.lua
@@ -13,16 +13,18 @@ function command.SET(key, value)
 	skynet.ret(last)
 end
 
-skynet.dispatch(function(msg, sz , session, from)
-	local message = skynet.tostring(msg,sz)
-	print("simpledb",message, skynet.address(from), session)
-	local cmd, key , value = string.match(message, "(%w+) (%w+) ?(.*)")
-	local f = command[cmd]
-	if f then
-		f(key,value)
-	else
-		skynet.ret("Invalid command : "..message)
-	end
+skynet.start(function()
+	skynet.dispatch("text", function(session, address, message)
+		print("simpledb",message, skynet.address(address), session)
+		local cmd, key , value = string.match(message, "(%w+) (%w+) ?(.*)")
+		local f = command[cmd]
+		if f then
+			f(key,value)
+		else
+			skynet.ret("Invalid command : "..message)
+		end
+	end)
+	skynet.register "SIMPLEDB"
 end)
 
-skynet.register "SIMPLEDB"
+
diff --git a/service/testconn.lua b/service/testconn.lua
deleted file mode 100644
index 306b140c..00000000
--- a/service/testconn.lua
+++ /dev/null
@@ -1,25 +0,0 @@
-local skynet = require "skynet"
-
--- register a dummy callback function
-skynet.dispatch()
-
-local connection = skynet.launch("connection","16")
-print("connection",connection)
-
-skynet.start(function()
-	local fd = skynet.call(".connection","CONNECT 127.0.0.1:8000")
-	if fd == nil then
-		print("Connect failed")
-		skynet.exit()
-		return
-	end
-	print("connect to ",fd)
-	skynet.send(".connection","WRITE "..fd.." Welcome\n")
-	local four = skynet.call(".connection","READ "..fd .." 4")
-	print("READ 4", four)
-	local line = skynet.call(".connection","READLINE "..fd .." \n")
-	skynet.send(".connection","WRITE "..fd.." "..line.."\n")
-	skynet.send(".connection","CLOSE "..fd)
-
-	skynet.exit()
-end)
diff --git a/service/testdb.lua b/service/testdb.lua
index d561984b..03e711b8 100644
--- a/service/testdb.lua
+++ b/service/testdb.lua
@@ -1,12 +1,9 @@
 local skynet = require "skynet"
 
--- register a dummy callback function
-skynet.dispatch()
-
 skynet.start(function()
-	local result = skynet.call("SIMPLEDB","SET foobar hello")
+	local result = skynet.call("SIMPLEDB","text","SET","foobar","hello")
 	print(result)
-	result = skynet.call("SIMPLEDB","GET foobar")
+	result = skynet.call("SIMPLEDB","text","GET","foobar")
 	print(result)
 	skynet.exit()
 end)
diff --git a/service/testgroup.lua b/service/testgroup.lua
index 9d4cb557..37d2dc5d 100644
--- a/service/testgroup.lua
+++ b/service/testgroup.lua
@@ -1,8 +1,6 @@
 local skynet = require "skynet"
 local group = require "mcgroup"
 
-skynet.dispatch()
-
 skynet.start(function()
 	local gid = group.create()
 	local gaddr = group.address(gid)
@@ -12,13 +10,6 @@ skynet.start(function()
 		group.enter(gid , address)
 	end
 	skynet.sleep(1000)
-	skynet.send(gaddr,"Hello World")
-
---	local group = skynet.query_group(1)
---	for i=1,10 do
---		local address = skynet.newservice("testgroup_c", tostring(i))
---		skynet.enter_group(1 , address)
---	end
---	skynet.send(group,"Hello World")
---	skynet.exit()
+	skynet.send(gaddr,"text","Hello World")
+	skynet.exit()
 end)
diff --git a/service/testgroup_c.lua b/service/testgroup_c.lua
index 3407c1a2..8309c68c 100644
--- a/service/testgroup_c.lua
+++ b/service/testgroup_c.lua
@@ -2,12 +2,10 @@ local skynet = require "skynet"
 local group = require "mcgroup"
 local id, g = ...
 
-skynet.dispatch(function (msg,sz)
-	print("===>",id, skynet.tostring(msg,sz))
-end
-)
-
 skynet.start(function()
+	skynet.dispatch("text",function(session,address,text)
+		print("===>",id, text)
+	end)
 	if g then
 		group.enter(tonumber(g))
 	end
diff --git a/service/testlog.lua b/service/testlog.lua
index b2d042c4..f14e8066 100644
--- a/service/testlog.lua
+++ b/service/testlog.lua
@@ -1,7 +1,9 @@
 local skynet = require "skynet"
 local log = require "log"
 
-skynet.dispatch()
+skynet.start(function()
+	log.Info("hello world")
+	skynet.exit()
+end)
 
-log.Info("hello world")
 
diff --git a/service/testredis.lua b/service/testredis.lua
index 264ee7e3..d02e7826 100644
--- a/service/testredis.lua
+++ b/service/testredis.lua
@@ -1,8 +1,6 @@
 local skynet = require "skynet"
 local redis = require "redis"
 
-skynet.dispatch()
-
 skynet.start(function()
 	local db = redis.connect "main"
 	print(db:exists "A")
diff --git a/service/testrobj.lua b/service/testrobj.lua
index 32ce341a..1f69f530 100644
--- a/service/testrobj.lua
+++ b/service/testrobj.lua
@@ -1,7 +1,5 @@
 local skynet = require "skynet"
 
-skynet.remote_service()
-
 local obj = { id = 0 }
 
 function obj.hello()
@@ -21,4 +19,5 @@ skynet.start(function()
 	local qobj = root.query "test"
 	print(qobj.hello())
 	print(qobj:inc())
+	skynet.exit()
 end)
diff --git a/service/testtimer.lua b/service/testtimer.lua
index 6b6a3a55..c6d64f36 100644
--- a/service/testtimer.lua
+++ b/service/testtimer.lua
@@ -1,8 +1,5 @@
 local skynet = require "skynet"
 
--- register a dummy callback function
-skynet.dispatch()
-
 local function timeout(t)
 	print(t)
 end
diff --git a/service/watchdog.lua b/service/watchdog.lua
index 707d3d56..cdc39ae8 100644
--- a/service/watchdog.lua
+++ b/service/watchdog.lua
@@ -13,7 +13,7 @@ function command:open(parm)
 	local agent = skynet.launch("snlua","agent",skynet.address(client))
 	if agent then
 		agent_all[self] = { agent , client }
-		skynet.send(gate, "forward ".. self .. " " .. skynet.address(agent) .. " " .. skynet.address(client))
+		skynet.send(gate, "text", "forward" , self, skynet.address(agent) , skynet.address(client))
 	end
 end
 
@@ -28,27 +28,31 @@ end
 function command:data(data, session)
 	local agent = agent_all[self]
 	if agent then
-		-- 0x7fffffff means it's a client
-		skynet.redirect(agent[1], agent[2], 0x7fffffff, data)
+		-- PTYPE_CLIENT = 3 , read skynet.h
+		skynet.redirect(agent[1], agent[2], "client", 0, data)
 	else
 		skynet.error(string.format("agent data drop %d size=%d",self,#data))
 	end
 end
 
-skynet.dispatch(function(msg, sz, session, address)
-	local message = skynet.tostring(msg,sz)
-	local id, cmd , parm = string.match(message, "(%d+) (%w+) ?(.*)")
-	id = tonumber(id)
-	local f = command[cmd]
-	if f then
-		f(id,parm,session)
-	else
-		skynet.error(string.format("[watchdog] Unknown command : %s",message))
-	end
-end)
+skynet.register_protocol {
+	name = "client",
+	id = 3,
+}
 
 skynet.start(function()
-	gate = skynet.launch("gate" , skynet.address(skynet.self()), port, max_agent, buffer)
-	skynet.send(gate,"start")
+	skynet.dispatch("text", function(session, from, message)
+		local id, cmd , parm = string.match(message, "(%d+) (%w+) ?(.*)")
+		id = tonumber(id)
+		local f = command[cmd]
+		if f then
+			f(id,parm,session)
+		else
+			error(string.format("[watchdog] Unknown command : %s",message))
+		end
+	end)
+	-- 0 for default client tag
+	gate = skynet.launch("gate" , skynet.address(skynet.self()), port, 0, max_agent, buffer)
+	skynet.send(gate,"text", "start")
 	skynet.register(".watchdog")
 end)
diff --git a/skynet-src/skynet.h b/skynet-src/skynet.h
index 00bda87c..1ca380f2 100644
--- a/skynet-src/skynet.h
+++ b/skynet-src/skynet.h
@@ -4,23 +4,27 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#define DONTCOPY 1
-#define SESSION_CLIENT 0x7fffffff
-#define SESSION_MULTICAST 0x7ffffffe
-#define SESSION_MAX 0x7ffffff0
+#define PTYPE_TEXT 0
+#define PTYPE_RESPONSE 1
+#define PTYPE_MULTICAST 2
+#define PTYPE_CLIENT 3
+#define PTYPE_SYSTEM 4
+#define PTYPE_HARBOR 5
+#define PTYPE_TAG_DONTCOPY 0x10000
+#define PTYPE_TAG_ALLOCSESSION 0x20000
 
 struct skynet_context;
 
 void skynet_error(struct skynet_context * context, const char *msg, ...);
 const char * skynet_command(struct skynet_context * context, const char * cmd , const char * parm);
 uint32_t skynet_queryname(struct skynet_context * context, const char * name);
-int skynet_send(struct skynet_context * context, uint32_t source, uint32_t destination , int session, void * msg, size_t sz, int flags);
-int skynet_sendname(struct skynet_context * context, const char * destination , int session, void * msg, size_t sz, int flags);
+int skynet_send(struct skynet_context * context, uint32_t source, uint32_t destination , int type, int session, void * msg, size_t sz);
+int skynet_sendname(struct skynet_context * context, const char * destination , int type, int session, void * msg, size_t sz);
 
 void skynet_forward(struct skynet_context *, uint32_t destination);
 int skynet_isremote(struct skynet_context *, uint32_t handle, int * harbor);
 
-typedef int (*skynet_cb)(struct skynet_context * context, void *ud, int session, uint32_t source , const void * msg, size_t sz);
+typedef int (*skynet_cb)(struct skynet_context * context, void *ud, int type, int session, uint32_t source , const void * msg, size_t sz);
 void skynet_callback(struct skynet_context * context, void *ud, skynet_cb cb);
 
 #endif
diff --git a/skynet-src/skynet_error.c b/skynet-src/skynet_error.c
index 3d525c52..db77eec7 100644
--- a/skynet-src/skynet_error.c
+++ b/skynet-src/skynet_error.c
@@ -2,7 +2,6 @@
 #include "skynet_handle.h"
 #include "skynet_mq.h"
 #include "skynet_server.h"
-#include "skynet_system.h"
 
 #include <stdarg.h>
 #include <stdio.h>
@@ -34,13 +33,13 @@ skynet_error(struct skynet_context * context, const char *msg, ...) {
 
 	struct skynet_message smsg;
 	if (context == NULL) {
-		smsg.source = SKYNET_SYSTEM_LOGGER;
+		smsg.source = 0;
 	} else {
 		smsg.source = skynet_context_handle(context);
 	}
 	smsg.session = 0;
 	smsg.data = strdup(tmp);
-	smsg.sz = len;
+	smsg.sz = len | (PTYPE_TEXT << 24);
 	skynet_context_push(logger, &smsg);
 }
 
diff --git a/skynet-src/skynet_group.c b/skynet-src/skynet_group.c
index 067e3c47..0e963f17 100644
--- a/skynet-src/skynet_group.c
+++ b/skynet-src/skynet_group.c
@@ -73,7 +73,7 @@ static void
 send_command(struct skynet_context *ctx, const char * cmd, uint32_t node) {
 	char * tmp = malloc(16);
 	int n = sprintf(tmp, "%s %x", cmd, node);
-	skynet_context_send(ctx, tmp, n+1 , 0, 0);
+	skynet_context_send(ctx, tmp, n+1 , 0, PTYPE_SYSTEM, 0);
 }
 
 void 
@@ -130,7 +130,7 @@ skynet_group_clear(int handle) {
 			
 			char * cmd = malloc(8);
 			int n = sprintf(cmd, "C");
-			skynet_context_send(ctx, cmd, n+1, 0 , 0);
+			skynet_context_send(ctx, cmd, n+1, 0 , PTYPE_SYSTEM, 0);
 			*pnode = node->next;
 			free(node);
 			break;
diff --git a/skynet-src/skynet_harbor.c b/skynet-src/skynet_harbor.c
index 6c4cf80e..d14f928a 100644
--- a/skynet-src/skynet_harbor.c
+++ b/skynet-src/skynet_harbor.c
@@ -1,3 +1,4 @@
+#include "skynet.h"
 #include "skynet_harbor.h"
 #include "skynet_server.h"
 
@@ -10,7 +11,10 @@ static int HARBOR = 0;
 
 void 
 skynet_harbor_send(struct remote_message *rmsg, uint32_t source, int session) {
-	skynet_context_send(REMOTE, rmsg, sizeof(*rmsg), source, session);
+	int type = rmsg->sz >> 24;
+	rmsg->sz &= 0xffffff;
+	assert(type != PTYPE_SYSTEM && type != PTYPE_HARBOR);
+	skynet_context_send(REMOTE, rmsg, sizeof(*rmsg) , source, type , session);
 }
 
 void 
@@ -25,7 +29,7 @@ skynet_harbor_register(struct remote_name *rname) {
 		}
 	}
 	assert(number == 0);
-	skynet_context_send(REMOTE, rname, sizeof(*rname), 0, 0);
+	skynet_context_send(REMOTE, rname, sizeof(*rname), 0, PTYPE_SYSTEM , 0);
 }
 
 int 
diff --git a/skynet-src/skynet_logger.c b/skynet-src/skynet_logger.c
index 56607eb7..068a3035 100644
--- a/skynet-src/skynet_logger.c
+++ b/skynet-src/skynet_logger.c
@@ -26,7 +26,7 @@ logger_release(struct logger * inst) {
 }
 
 static int
-_logger(struct skynet_context * context, void *ud, int session, uint32_t source, const void * msg, size_t sz) {
+_logger(struct skynet_context * context, void *ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
 	struct logger * inst = ud;
 	fprintf(inst->handle, "[%x] ",source);
 	fwrite(msg, sz , 1, inst->handle);
diff --git a/skynet-src/skynet_mq.c b/skynet-src/skynet_mq.c
index 966b7eff..569e8614 100644
--- a/skynet-src/skynet_mq.c
+++ b/skynet-src/skynet_mq.c
@@ -193,7 +193,8 @@ _drop_queue(struct message_queue *q) {
 	int s = 0;
 	while(!skynet_mq_pop(q, &msg)) {
 		++s;
-		if (msg.session == SESSION_MULTICAST) {
+		int type = msg.sz >> 24;
+		if (type == PTYPE_MULTICAST) {
 			assert(msg.sz == 0);
 			skynet_multicast_dispatch((struct skynet_multicast_message *)msg.data, NULL, NULL);
 		} else {
diff --git a/skynet-src/skynet_multicast.c b/skynet-src/skynet_multicast.c
index 9f462b1d..374437be 100644
--- a/skynet-src/skynet_multicast.c
+++ b/skynet-src/skynet_multicast.c
@@ -214,7 +214,7 @@ skynet_multicast_castgroup(struct skynet_context * from, struct skynet_multicast
 	int release = 0;
 	for (i=0;i<group->number;i++) {
 		struct pair * p = &group->data[i];
-		skynet_context_send(p->ctx, msg, 0 , source, SESSION_MULTICAST);
+		skynet_context_send(p->ctx, msg, 0 , source, PTYPE_MULTICAST , 0);
 		int ref = skynet_context_ref(p->ctx);
 		if (ref == 1) {
 			skynet_context_release(p->ctx);
diff --git a/skynet-src/skynet_server.c b/skynet-src/skynet_server.c
index 91f13fa3..9b40cbee 100644
--- a/skynet-src/skynet_server.c
+++ b/skynet-src/skynet_server.c
@@ -17,8 +17,6 @@
 #define BLACKHOLE "blackhole"
 #define DEFAULT_MESSAGE_QUEUE 16 
 
-#define CALLING_CHECK
-
 #ifdef CALLING_CHECK
 
 #define CHECKCALLING_BEGIN(ctx) assert(__sync_lock_test_and_set(&ctx->calling,1) == 0);
@@ -108,11 +106,6 @@ skynet_context_new(const char * name, const char *param) {
 int
 skynet_context_newsession(struct skynet_context *ctx) {
 	int session = ++ctx->session_id;
-	if (session >= SESSION_MAX) {
-		ctx->session_id = 1;
-		return 1;
-	}
-
 	return session;
 }
 
@@ -194,7 +187,9 @@ _forwarding(struct skynet_context *ctx, struct skynet_message *msg) {
 static void
 _mc(void *ud, uint32_t source, const void * msg, size_t sz) {
 	struct skynet_context * ctx = ud;
-	ctx->cb(ctx, ctx->cb_ud, 0, source, msg, sz);
+	int type = sz >> 24;
+	sz &= 0xffffff;
+	ctx->cb(ctx, ctx->cb_ud, type, 0, source, msg, sz);
 	if (ctx->forward) {
 		uint32_t des = ctx->forward;
 		ctx->forward = 0;
@@ -203,7 +198,7 @@ _mc(void *ud, uint32_t source, const void * msg, size_t sz) {
 		message.session = 0;
 		message.data = malloc(sz);
 		memcpy(message.data, msg, sz);
-		message.sz = sz;
+		message.sz = sz  | (type << 24);
 		_send_message(des, &message);
 	}
 }
@@ -212,13 +207,12 @@ static void
 _dispatch_message(struct skynet_context *ctx, struct skynet_message *msg) {
 	assert(ctx->init);
 	CHECKCALLING_BEGIN(ctx)
-	if (msg->source == SKYNET_SYSTEM_TIMER) {
-		ctx->cb(ctx, ctx->cb_ud, msg->session, 0, msg->data, msg->sz);
-	} else if (msg->session == SESSION_MULTICAST) {
-		assert(msg->sz == 0);
+	int type = msg->sz >> 24;
+	size_t sz = msg->sz & 0xffffff;
+	if (type == PTYPE_MULTICAST) {
 		skynet_multicast_dispatch((struct skynet_multicast_message *)msg->data, ctx, _mc);
 	} else {
-		int reserve = ctx->cb(ctx, ctx->cb_ud, msg->session, msg->source, msg->data, msg->sz);
+		int reserve = ctx->cb(ctx, ctx->cb_ud, type, msg->session, msg->source, msg->data, sz);
 		reserve |= _forwarding(ctx, msg);
 		if (!reserve) {
 			free(msg->data);
@@ -413,7 +407,7 @@ skynet_command(struct skynet_context * context, const char * cmd , const char *
 			return NULL;
 		} else {
 			_id_to_hex(context->result, inst->handle);
-			printf("launch %s : %x\n",param, inst->handle);
+			printf("[:%x] launch %s\n",inst->handle, param);
 			return context->result;
 		}
 	}
@@ -466,43 +460,57 @@ skynet_forward(struct skynet_context * context, uint32_t destination) {
 	context->forward = destination;
 }
 
-int
-skynet_send(struct skynet_context * context, uint32_t source, uint32_t destination , int session, void * data, size_t sz, int flags) {
-	int session_id = session;
-	if (source == 0) {
-		source = context->handle;
-		if (session < 0) {
-			session = skynet_context_newsession(context);
-			session_id = - session;
-		}
-	} 
+static void
+_filter_args(struct skynet_context * context, int type, int *session, void ** data, size_t * sz) {
+	int dontcopy = type & PTYPE_TAG_DONTCOPY;
+	int allocsession = type & PTYPE_TAG_ALLOCSESSION;
+	type &= 0xff;
+
+	if (allocsession) {
+		assert(*session == 0);
+		*session = skynet_context_newsession(context);
+	}
 
 	char * msg;
-	if ((flags & DONTCOPY) || data == NULL) {
-		msg = data;
+	if (dontcopy || *data == NULL) {
+		msg = *data;
 	} else {
-		msg = malloc(sz+1);
-		memcpy(msg, data, sz);
-		msg[sz] = '\0';
+		msg = malloc(*sz+1);
+		memcpy(msg, *data, *sz);
+		msg[*sz] = '\0';
 	}
+	*data = msg;
+
+	assert((*sz & 0xffffff) == *sz);
+	*sz |= type << 24;
+}
+
+int
+skynet_send(struct skynet_context * context, uint32_t source, uint32_t destination , int type, int session, void * data, size_t sz) {
+	_filter_args(context, type, &session, (void **)&data, &sz);
+
+	if (source == 0) {
+		source = context->handle;
+	}
+
 	if (destination == 0) {
 		return session;
 	}
 	if (skynet_harbor_message_isremote(destination)) {
 		struct remote_message * rmsg = malloc(sizeof(*rmsg));
 		rmsg->destination.handle = destination;
-		rmsg->message = msg;
+		rmsg->message = data;
 		rmsg->sz = sz;
-		skynet_harbor_send(rmsg, source, session_id);
+		skynet_harbor_send(rmsg, source, session);
 	} else {
 		struct skynet_message smsg;
 		smsg.source = source;
-		smsg.session = session_id;
-		smsg.data = msg;
+		smsg.session = session;
+		smsg.data = data;
 		smsg.sz = sz;
 
 		if (skynet_context_push(destination, &smsg)) {
-			free(msg);
+			free(data);
 			skynet_error(NULL, "Drop message from %x to %x (size=%d)", source, destination, (int)sz);
 			return -1;
 		}
@@ -511,67 +519,32 @@ skynet_send(struct skynet_context * context, uint32_t source, uint32_t destinati
 }
 
 int
-skynet_sendname(struct skynet_context * context, const char * addr , int session, void * data, size_t sz, int flags) {
-	int session_id = session;
-	uint32_t source_handle = context->handle;
-	if (session < 0) {
-		session = skynet_context_newsession(context);
-		session_id = - session;
-	}
-
-	char * msg;
-	if ((flags & DONTCOPY) || data == NULL) {
-		msg = data;
-	} else {
-		msg = malloc(sz+1);
-		memcpy(msg, data, sz);
-		msg[sz] = '\0';
-	}
-	if (addr == NULL) {
-		return session;
-	}
+skynet_sendname(struct skynet_context * context, const char * addr , int type, int session, void * data, size_t sz) {
+	uint32_t source = context->handle;
 	uint32_t des = 0;
 	if (addr[0] == ':') {
 		des = strtoul(addr+1, NULL, 16);
 	} else if (addr[0] == '.') {
 		des = skynet_handle_findname(addr + 1);
 		if (des == 0) {
-			free(msg);
-			skynet_error(context, "Drop message to %s, size = %d", addr, (int)sz);
+			free(data);
+			skynet_error(context, "Drop message to %s", addr);
 			return session;
 		}
 	} else {
+		_filter_args(context, type, &session, (void **)&data, &sz);
+
 		struct remote_message * rmsg = malloc(sizeof(*rmsg));
 		_copy_name(rmsg->destination.name, addr);
 		rmsg->destination.handle = 0;
-		rmsg->message = msg;
+		rmsg->message = data;
 		rmsg->sz = sz;
-		skynet_harbor_send(rmsg, source_handle, session_id);
+
+		skynet_harbor_send(rmsg, source, session);
 		return session;
 	}
 
-	assert(des > 0);
-
-	if (skynet_harbor_message_isremote(des)) {
-		struct remote_message * rmsg = malloc(sizeof(*rmsg));
-		rmsg->destination.handle = des;
-		rmsg->message = msg;
-		rmsg->sz = sz;
-		skynet_harbor_send(rmsg, source_handle, session_id);
-	} else {
-		struct skynet_message smsg;
-		smsg.source = source_handle;
-		smsg.session = session_id;
-		smsg.data = msg;
-		smsg.sz = sz;
-
-		if (skynet_context_push(des, &smsg)) {
-			free(msg);
-			skynet_error(NULL, "Drop message from %x to %s (size=%d)", smsg.source, addr, (int)sz);
-			return -1;
-		}
-	}
-	return session;
+	return skynet_send(context, source, des, type, session, data, sz);
 }
 
 uint32_t 
@@ -592,12 +565,12 @@ skynet_callback(struct skynet_context * context, void *ud, skynet_cb cb) {
 }
 
 void
-skynet_context_send(struct skynet_context * ctx, void * msg, size_t sz, uint32_t source, int session) {
+skynet_context_send(struct skynet_context * ctx, void * msg, size_t sz, uint32_t source, int type, int session) {
 	struct skynet_message smsg;
 	smsg.source = source;
 	smsg.session = session;
 	smsg.data = msg;
-	smsg.sz = sz;
+	smsg.sz = sz | type << 24;
 
 	skynet_mq_push(ctx->queue, &smsg);
 }
diff --git a/skynet-src/skynet_server.h b/skynet-src/skynet_server.h
index 5297c834..07275700 100644
--- a/skynet-src/skynet_server.h
+++ b/skynet-src/skynet_server.h
@@ -14,7 +14,7 @@ int skynet_context_ref(struct skynet_context *);
 uint32_t skynet_context_handle(struct skynet_context *);
 void skynet_context_init(struct skynet_context *, uint32_t handle);
 int skynet_context_push(uint32_t handle, struct skynet_message *message);
-void skynet_context_send(struct skynet_context * context, void * msg, size_t sz, uint32_t source, int session);
+void skynet_context_send(struct skynet_context * context, void * msg, size_t sz, uint32_t source, int type, int session);
 int skynet_context_newsession(struct skynet_context *);
 int skynet_context_message_dispatch(void);	// return 1 when block
 
diff --git a/skynet-src/skynet_system.h b/skynet-src/skynet_system.h
deleted file mode 100644
index 9b671977..00000000
--- a/skynet-src/skynet_system.h
+++ /dev/null
@@ -1,8 +0,0 @@
-#ifndef SKYNET_MESSAGE_SYSTEM_H
-#define SKYNET_MESSAGE_SYSTEM_H
-
-#define SKYNET_SYSTEM_TIMER 1
-#define SKYNET_SYSTEM_LOGGER 2
-#define SKYNET_SYSTEM_NAME 3
-
-#endif
diff --git a/skynet-src/skynet_timer.c b/skynet-src/skynet_timer.c
index 44a5743a..a7f76186 100644
--- a/skynet-src/skynet_timer.c
+++ b/skynet-src/skynet_timer.c
@@ -2,6 +2,7 @@
 #include "skynet_mq.h"
 #include "skynet_server.h"
 #include "skynet_handle.h"
+#include "skynet.h"
 
 #include <time.h>
 #include <assert.h>
@@ -111,10 +112,10 @@ timer_execute(struct timer *T)
 		do {
 			struct timer_event * event = (struct timer_event *)(current+1);
 			struct skynet_message message;
-			message.source = SKYNET_SYSTEM_TIMER;
+			message.source = 0;
 			message.session = event->session;
 			message.data = NULL;
-			message.sz = 0;
+			message.sz = PTYPE_RESPONSE << 24;
 
 			skynet_context_push(event->handle, &message);
 			
@@ -177,10 +178,10 @@ int
 skynet_timeout(uint32_t handle, int time, int session) {
 	if (time == 0) {
 		struct skynet_message message;
-		message.source = SKYNET_SYSTEM_TIMER;
+		message.source = 0;
 		message.session = session;
 		message.data = NULL;
-		message.sz = 0;
+		message.sz = PTYPE_RESPONSE << 24;
 
 		if (skynet_context_push(handle, &message)) {
 			return -1;
diff --git a/skynet-src/skynet_timer.h b/skynet-src/skynet_timer.h
index 3df0328b..4d4e2b0f 100644
--- a/skynet-src/skynet_timer.h
+++ b/skynet-src/skynet_timer.h
@@ -1,8 +1,6 @@
 #ifndef SKYNET_TIMER_H
 #define SKYNET_TIMER_H
 
-#include "skynet_system.h"
-
 #include <stdint.h>
 
 int skynet_timeout(uint32_t handle, int time, int session);