That is completely dependant on which games you wish to play. Chances are you will need a faster processor to be able to play games such as Gears of war 2 which requires a minimum of 2.4 Ghz. Unreal tournament 3 - 2.8 Ghz, Bioshock - 2.4, C&C3 - 2.4.
You can play Portal though: It only has 1.7 Ghz minimum requirement.
basically your not going to be able to play much with a 1.8 Ghz processor and even if you do, the games you play will probably have to be set to the lowest graphics settings and will still lag like crazy.
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You can run it on any computer as long as it has specs that are good enough for mc which most computers do have
A good gaming headset for Xbox 360 is a Turtle Beachheadset.
Xp is okay,but to get the most out of gaming you will need to get a gaming. I am not sure about Macintosh.
No not the best for GAMING But good for media or anything else. Laptops that dont have a certain games processor wont give you the best gaming.
gumby