Only one person per X-box can play Call of Duty 4 online.
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no
yes, call of duty world at war has online. you go into multiplayer and click play online.
you cant a ps2 does not play online games
if you want to play online you will have to
All of the newer call of duty games can be played online. I've been playing since Call of Duty 4, and they are making Call of Duty 8 right now, and all have been online enabled.