Quake4 Opencoop is mod for playing Quake4 cooperatively. Playing coop means that you play with your buddies against the Strogg in then normal singleplayer levels. OpenCoop is intented to support up to four players. It enhances the original Quake4 game in several ways: The monsters are now synchronised over the network and fight against the player and his team. The scripted sequences as well as the cinematics are working over then network so you can enjoy the whole singleplayer universe of Quake4. In this initial version we already managed it to get the vehicle synchronisation working. Players can drive the hover tank and jump into the walker. However this is only the first tech demo of Q4 OpenCoop. Created as a preview there many features are still missing.