I'm trying to develop a game that can be played by 2 players on different clients, and I can't figure out the mechanism how the server can communicate to both sites for the same game. A move on one browser gets communicated to the server, and the server must reply to both players. I understand PHP somewhat, but need help. I have developed the game on the browser using Javascript, which can be seen at www.dynodice.com . I'm a professional programmer with 40 years experience, but I'm a bit weak in this kind of gaming. Any advice?