Don't have an Apple myself but here's what I found...
Command (Apple key) + shift + 3
Screenshot should be either in the root of your startup disk or on your desktop.
Hope it works.
InterMilan31
Thanks mate
musiqzone
you can also use the program "grab" in your apps. if you have OSX. it's not much different than using the shortcut keys but you can capture a selection, window, screen shot or timed screen shot with it.