On every Game Instance there is a method called SendEventToClientFromServer. This allows you to send a message to any client from the server, you just need to know thier client id.
//Example Implementation, in the "client_sent_event" scriptswitch(eventName){case"chat":var chatMessage =messageStruct.chatMessage //sent by client chatMessage =CussWordsFilter(chatMessage) //some function to clean cuss words//now send this chat to everyone in the room//firstly find the room this sender belongs to, then send the message to everyonefor(var roomId ingame.rooms){if(game.rooms[roomId].clients.hasOwnProperty(senderClientId){//we found the sender//now send the message to everyone herefor(var clientId in game.rooms[roomId].clients){//make a messageStruct to send everyonevar a = { message: chatMessage, sender: clientId }game.SendEventToClientFromServer(clientId,"cuss_free_chat", a) } } } break;}