A screen shot (also called screen capture, screencap, screen grab, or screen dump) is an image captured by an Operating System or a 3rd-party application that records what was visible to the user at the time of the screenshot.
In Mac OS X the following keystrokes will take screenshots.
⌘ Cmd+⇧ Shift+3 – takes a screen capture of the entire screen and saves to a file on the desktop. Example name generated: “Screen Shot 2013-01-15 at 7.15.41”
⌘ Cmd+⇧ Shift+4 – select an area by clicking and dragging. Screenshot output is placed on the desktop.
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⌘ Cmd+⇧ Shift+4+ Spacebar – allows you to take a screen shot of a specific window. As with the previous step do ⌘ Cmd+⇧ Shift+4. Once over the window you’d like to screen grab press the Spacebar. A camera icon will appear then Right Click.
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