如何以最小的开销实现简单的无服务器p2p浏览器到浏览器消息传递?

I'm trying to create some basic implementations of simple games (tic tac toe is the starting project) which can be played over the internet without requiring a central server. The page would not even need to be hosted and could be run locally on the machine, or it could be hosted on a web server. When hosting the game, the page would inform the host of his IP address, which could then be sent by any method (phone, instant message, etc) to a friend. That friend would type or copy/paste the IP into a join dialog and be able to play the game in question. I would like these 2 parties to be able to do this without installing any additional software, and without contacting a central server of any kind.I'm trying to create some basic implementations