I just want to post How to Take A pic on a Mac!
OS X or higher!
To take a full screen shot of the desktop:
Hold shift, apple key, and 3 and click on the screen any where and, on the desktop there should be a .png called picture (1,2,3... etc.)
To take a pic of a selected area:
Press Apple key, Shift, 4 . (Mac OS X 10.1 or higher) The cursor will change into a crosshair. Hold down the mouse button, drag the crosshair over the portion of the screen you wish to take a picture of, and then release the mouse button.
a .png will pop up on the desktop.
Sorry, i saw there was no mac instructions.