I just spent about 20 minutes trying to figure out how to take screen shots in Windows XP on my MacBook Pro (using Boot Camp). I thought I would write up the simplest answer of how to do this, in the sense that you don’t have to install anything or remap your keyboard. Here’s all you have to do:
Under the Start menu, select All Programs, then Accessories, then Accessibility, and then On-Screen Keyboard. When you do this the Windows XP on-screen keyboard will appear on your screen. This on-screen utility includes the PrintScreen button (labelled psc in the same position as where the F13 key should be located. That’s it.
If you want to take a screen shot of only the active window (using the Alt+psc command), make sure that the on-screen keyboard isn’t in the area of the active window, otherwise it will be included in the screen shot.
Anyway, I searched around for far too long to find that little piece of information, so hopefully someone in the same predicament will easily be able to find this post (and the answer)! Since the Apple external keyboards actually include the F13 key (while the MacBook and MacBook Pro built-in keyboards do not), you can use PrintScreen slightly easier with the plugged-in keyboard.
UPDATE: As pointed out by Stuart in the comments below, if you’re using Boot Camp v. 1.3, Fn + F11 now maps to print screen. You can print only the active window with Option + Fn + F11. Thanks for the tip!
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