Yes you can.
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yes.if you use valves steam community you can use the steam cloud feature to put games from windows to apple mac
NO but if you use bootcamp you can play it on Vista/ XP, or you can use Crossover games
use Windows Bootcamp... it allows you to play Windows games and other stuff
Yes you can, you import and add non-steam games to your Steam library. From within the library you can launch and run any games, although 'Steam achievements' will only be available for Steam enabled games.
yes, i use a mac to play minecraft :D