Editing Command & Conquer (section)

===Multiplayer===
Each ''Command & Conquer'' game has included the ability to play multiplayer games against other players. Each box of ''Command & Conquer'' contained two CD copies of the game, making [[multiplayer|multiplayer gaming]] possible with a single purchase of the game. Westwood Studios advertised this on the packaging with the slogan "A second copy, so you and your friend can destroy each other." This resulted in ''Command & Conquer'' becoming the first RTS game title to feature competitive online play,<ref name="C&CRTSInfluence" /> and this is considered the most pertinent outside factor in the success of ''Command & Conquer''.<ref name="ccorigins" /> All games in the series up to ''Command & Conquer: Red Alert 2'' featured two CDs that could be used for this reason. Later games did not.

''Command & Conquer: Red Alert 3'' was noted for being the first RTS game to enable the campaigns to be played cooperatively online; others had only supported single player campaigns. However, it was only possible to connect to other computers through EA's servers and not with [[LAN]] play.

Games produced by Westwood use the proprietary Westwood Online system to facilitate multiplayer games over the Internet; ''Renegade'' also supported [[GameSpy]]. Games under EA's development continued to use GameSpy, but dropped support for Westwood Online in favor of using EA's own servers. The GameSpy master servers have shut down in 2013,<ref>Dan Stapleton [http://au.pc.gamespy.com/articles/122/1227460p1.html Goodbye, And Thank You From The GameSpy Team] {{webarchive |url=https://web.archive.org/web/20130222133146/http://au.pc.gamespy.com/articles/122/1227460p1.html |date=February 22, 2013 }} February 21, 2013</ref> but some game titles can be played via [[Gameranger]].