Welcome to the Apple Support Communities
To take a screenshot, press:
- Command, Shift and 3 keys > take a screenshot of the whole display.
- Command, Shift and 4 keys > take a screenshot of one portion of the display.
- Command, Shift, 4 and Space keys > take a screenshot of a window.
On Mac OS X Snow Leopard, it's not possible to use AirPrint, but if you have the printer attached to a network, you can access to it wirelessly. Another option is to use Bonjour on your PC and share the printer with your Mac