call of duty 4

[AceLuby]

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quick question, can people who have xbox play against people who have ps3 or PC? or does each system have their own multiplayer servers?

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Each system is separate, but I believe only the PC has 'servers'. PS3 uses PSN to match players and the 360 uses Live, but the games aren't hosted on their servers. Someone please correct me if I'm wrong here as I'm not 100% sure.