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As Tufty McTavish says the two versions of Gears Of War are entirely seperate - if you look at my account you will see I have both GOW versions listed. Cross platform elements are starting to appear though. The Kane & Lynch achievements on my Gamertag were achieved on the PC - but if I purchased the Xbox 360 version I would get a second entry - achievements would just continue where they left off. One or two games have attempted cross platform gameplay - Shadowrun for example - but the significant differences in control between gamepads and mouse/keyboard makes it unviable for many games.