IV:Multiplayer (IV:MP) is a modification for Grand Theft Auto: IV (GTA:IV) which turns it into an alternative multiplayer game. You can play over the internet (or LAN). You need the original GTA:IV PC game to play IV:MP.
http://www.iv-multiplayer.com/index
seems like the first big successfull mod to come out for gta 4
http://www.iv-multiplayer.com/index
seems like the first big successfull mod to come out for gta 4