Same as in XP but you have to install the vender software
The 'windows button' - located to the left of the keyboard, between the FN and ALT keys
Yes, Minecraft will probably work. I don't think you can use the function keys (F1, F5, etc.) on W7, however.
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as its new, it will work for windows 7
Yes, Google Chrome can work on a desktop/laptop with Windows XP SP3.
Yes, standard mouse does work with Windows 7.
Yes, Dungeons and Dragons Online will work on Windows 7.
Yes - Open Office will work with Windows 7.
Windows 7 requires more RAM and processing power than Windows 98 computers because of its enhanced UI and the amount of background services it runs to make your computer work and function properly. It might possibly run the lightest version of Windows 7, called Windows 7 Starter.
Yes, the Warcraft series of RTS games should work fine in Windows 7. The MMORPG World of Warcraft will definitely work in Windows 7.
Windows 7 will work on a recent Mac (See links below).
It will definitely work on windows 9000 but I'm not sure about windows 7