Online Multi-platform games

[IT]

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My friend has a 360 and I am a computer gamer. I am trying to find games that we can play together online. He refuses to play on the computer and I suck at console gaming. I was wondering if Call of Duty 4 multiplayer is a cross-platform game. If anyone knows of any games that are it would be great.

[vern]

Games that are marked "Games for Windows" should work with each other. As always, not all developers make their games to take full advantage of this though.