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Summary: Take a snapshot of a Mac's screen by hitting command, shift and three to capture a picture of the whole screen. Learn to take snapshots using a Macintosh with tips from a computer specialist in this free video on Mac computers.
Jason Hendricks is a Macintosh genius who works for the Mac Store in Denver, Colo.read more
"Hi I'm Jason previous Mac genius and today we're going to talk about screen capturing, the whole screen and the section of the screen on a Mac. This is actually built into the system, so what I'm going to do is I'm going to open up a window. And on the keyboard, this is a keyboard thing. I'm going to command shift three. And you heard that camera shot, that's now going to put on my desktop, a picture of the whole screen. If I want to just take a part of a picture there's another command which I'm going to use. And that is command shift instead of three we're going to hit four this time. And can see the mouse turns into a little cross here, and if I click and drag over this window, you're going to hear the snap shot again. And that basically gives us our picture of just the window. So you can see that you can drag a marquee around specific sections of the screen. Again those options are command shift three will take a picture of the whole screen. Command option four will take a picture of what you drag a marquee around. Or whatever area you drag, a window, or a section of the screen or anything like that. And those will automatically save on your desktop, those are built into Mac OS X. And that's it, I'm Jason Mac, previous Mac genius. And I will speak with you later."
eHow Article: How to Take a Snapshot of a Mac's Screen