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http://oreilly.com/digitalmedia/2006/01/01/mac-os-x-screenshot-secrets.html

Mac OS X Screenshot Secrets | O'Reilly Media

In one way, Windows users have it easy: to copy a picture of their computer screen to the clipboard, all they have to do is press the Print Screen key. Mac users have to press the arcane combination Command+Shift+Control+3. Three years ago, O'Reilly's MacDevCenter discussed that technique and more in Screenshot Hacks for Mac OS X . It's an easy-to-follow tutorial, which I'll summarize below.