How do I make a screenshot?

How do I make a screenshot?

If you have PrintKey installed on your Windows PC, press the PrintScreen key (for the active window, press Alt-PrintScreen). You may then print or save the screenshot to a file using the appropriate icon from the menu bar at the top of the screen.

See other ways of taking a screenshot: http://windows.about.com/od/keyboardshortcuts/qt/screen_shot.htm, and for mac users, http://graphicssoft.about.com/od/screencapturemac/ht/macscreenshot.htm