Multiplayer
From Supreme Commander Wiki
Multiplayer refers to games against other humans, in contrast to single player. It is still posible to have the computer(s) to add an AI participant, too.
One player is the host of the game and others join. Finding a person hosting can be managed by the GPGNet program included with Supreme Commander, or you have to know the IP address of the host. If the host is on the LAN (houshold, office, internet café) you can find it within Supreme Commander.
Games managed by GPGNet include custom and ranked games. Ranked games affect a player's rating, to help match players of relatively equal skill.
Gas Powered Games published an official multiplayer FAQ.
