diff --git a/rsctrl/src/definition/chat.proto b/rsctrl/src/definition/chat.proto
new file mode 100644
index 000000000..b80c41ae3
--- /dev/null
+++ b/rsctrl/src/definition/chat.proto
@@ -0,0 +1,212 @@
+package rsctrl.chat;
+
+import "core.proto";
+
+///////////////////////////////////////////////////////////////
+// Private, Group and Chat Lobby RPC.
+///////////////////////////////////////////////////////////////
+
+enum RequestMsgIds {
+    MsgId_RequestChatLobbies = 1;
+    MsgId_RequestCreateLobby = 2;
+    MsgId_RequestJoinOrLeaveLobby = 3;
+    MsgId_RequestSetLobbyNickname = 4;
+    MsgId_RequestRegisterEvents = 5;
+    MsgId_RequestSendMessage = 6;
+}
+
+enum ResponseMsgIds {
+    // STANDARD RESPONSES.
+    MsgId_ResponseChatLobbies = 1;
+    MsgId_ResponseRegisterEvents = 2;
+    MsgId_ResponseSendMessage = 6;
+
+    // EVENTS
+    MsgId_EventLobbyInvite = 101;
+    MsgId_EventChatMessage = 102;
+}
+
+///////////////////////////////////////////////////////////////
+// BUILDING BLOCKS.
+
+// This is a combination of ChatLobbyInfo & PublicChatLobbyRecord.
+// Which seem very similar??
+  
+enum LobbyPrivacyLevel {
+    PRIVATE = 1;
+    PUBLIC  = 2; 
+}
+
+enum ChatType {
+    TYPE_PRIVATE = 1;
+    TYPE_LOBBY = 2;
+    TYPE_GROUP = 3;
+}
+
+message ChatLobbyInfo {
+  required string lobby_id	= 1;
+  required string lobby_topic	= 2;
+  required string lobby_name	= 3;
+
+  required string lobby_nickname = 4; // empty for none set.
+
+  enum LobbyState {
+    JOINED = 1;
+    INVITED = 2;
+    PUBLIC = 3;
+  }
+  
+  required LobbyPrivacyLevel privacy_level   = 5;
+  required LobbyState   lobby_state = 6;
+
+  required uint32 no_peers 	= 7;
+  required uint32 last_report_time = 8;
+  required uint32 last_activity    = 9;
+  
+  repeated string participating_friends  = 10; // SSL_IDS?
+  repeated string nick_names = 11;
+}
+
+
+message ChatMessage {
+
+  required ChatType chat_type   = 1;
+  required string chat_id	= 2;
+
+  required string peer_nickname = 3;
+  required uint32 chatflags	= 4;
+
+  required uint32 sendTime	= 5;
+  required uint32 recvTime	= 6;
+
+  required string msg 		= 7;
+  }
+
+
+// RESPONSE: ResponseChatLobbies
+// This is a generic Response - used often.
+// lobbies, will contain a list of affected / requested Lobbies.
+message ResponseChatLobbies {
+
+  required rsctrl.core.Status status = 1;
+  repeated ChatLobbyInfo lobbies = 2;
+}
+
+
+
+///////////////////////////////////////////////////////////////
+
+// REQUEST: RequestChatLobbies
+message RequestChatLobbies {
+
+  enum LobbyType {
+    ALL = 1;
+    NEW = 2;
+    INVITED = 3;
+    PRIVATE = 4;
+    PUBLIC = 5;
+  }
+
+  required LobbyType lobby_type = 1;
+  
+}
+
+// RESPONSE: ResponseChatLobbies
+
+///////////////////////////////////////////////////////////////
+
+
+// REQUEST: RequestCreateLobby
+message RequestCreateLobby {
+
+  required string lobby_name	= 1;
+  required string lobby_topic	= 2;
+
+  required LobbyPrivacyLevel privacy_level   = 4;
+
+  repeated string invited_friends  = 3; // SSL_IDS?
+}
+
+// RESPONSE: ResponseChatLobbies
+
+///////////////////////////////////////////////////////////////
+
+// Accept / Deny Invite, Join / Leave Lobby (these can be combined?)
+
+// REQUEST: RequestJoinOrLeaveLobby
+message RequestJoinOrLeaveLobby {
+
+  enum LobbyAction {
+    JOIN_OR_ACCEPT = 1;
+    LEAVE_OR_DENY = 2;
+  }
+  
+  required string lobby_id	= 1;
+  required LobbyAction action   = 2;
+}
+
+// RESPONSE: ResponseChatLobbies
+
+///////////////////////////////////////////////////////////////
+
+// Set Nickname.
+// Get is done via requesting ChatLobby Info.
+// Empty lobby_ids => default id.
+
+// REQUEST: RequestSetLobbyNickname
+message RequestSetLobbyNickname {
+  required string nickname = 1;
+  repeated string lobby_ids = 2;
+}
+
+// RESPONSE: ResponseChatLobbies
+
+///////////////////////////////////////////////////////////////
+
+// Request Chat Events.
+// This is done by registering for events.
+
+// REQUEST: ReqestRegisterEvents
+message RequestRegisterEvents {
+
+  enum RegisterAction {
+    REGISTER = 1;
+    DEREGISTER = 1;
+  }
+  
+  required RegisterAction action = 1;
+}
+
+// RESPONSE: ResponseRegisterEvents
+message ResponseRegisterEvents {
+  required rsctrl.core.Status status = 1;
+}
+
+// RESPONSE: EventLobbyInvite
+message EventLobbyInvite {
+  required ChatLobbyInfo lobby = 1;
+}
+
+// RESPONSE: EventChatMessage
+message EventChatMessage {
+  required ChatMessage msg = 1;
+}
+
+///////////////////////////////////////////////////////////////
+// Send Message.
+
+// Request Chat Events.
+// This is done by registering for events.
+
+// REQUEST: RequestSendMessage
+message RequestSendMessage {
+  required ChatMessage msg = 2;
+}
+
+// RESPONSE: ResponseSendMessage
+message ResponseSendMessage {
+  required rsctrl.core.Status status = 1;
+}
+
+///////////////////////////////////////////////////////////////
+
diff --git a/rsctrl/src/definition/core.proto b/rsctrl/src/definition/core.proto
index 58da5bef8..ddf3f2466 100644
--- a/rsctrl/src/definition/core.proto
+++ b/rsctrl/src/definition/core.proto
@@ -14,8 +14,10 @@ enum ExtensionId { CORE = 0; }
 enum PackageId { 
   PEERS = 1; 
   SYSTEM = 2;
-  FILES = 3;
-  MSGS = 4;
+  // BELOW HERE IS STILL BEING DESIGNED.
+  //CHAT = 3;
+  //FILES = 4;
+  //MSGS = 5;
 
   // THEORETICAL ONES.
   GXS = 1000;