connecting players to a game

There are many multiplayer games I have developed. However, the only problem is how the players communicate their IP addresses because everytime someone logs onto the internet, their IP address may change. I tried the email feature but that does not work all the time because some users have hotmail accounts. ## Deliverables The methods that can be used to communicate the IP addresses of the people playing the games so they can connect to each other. ## Platform Windows 2000, Windows 98, Windows XP ## Deadline information Should be completed within 1 day after accepting the bid.