Do It Yourself with the Keyboard
Have you ever wanted to send someone an image of your Mac screen? This is known as a screenshot, and taking one is extremely easy to do on your Mac with a few keyboard shortcuts and a mouse click.
There are three types of screenshots you can take on your Mac using keyboard commands:
Command+Shift+3 : Use this keyboard combination to take a straight picture of your entire screen. Whatever is shown on your screen appears on your shot.
Command+Shift+4 : Use this combination to take a picture of a selection of your screen. This key combination will turn your cursor arrow into a crosshair. Click and drag the crosshair over what you want to take a picture of and unclick.
Command+Shift+4 followed by space: Use this command to take a picture of a specific window on your screen. This key combination will turn your arrow into a camera icon. Moving the icon over different windows on your screen will darken the screen around that window. Click when you have the window selected and a picture of that window will be taken.
If you start the process of one of the last two methods mentioned and want to abort the process, just press the “esc" key.
Whenever you take a screenshot with one of these methods, the file will be placed on your desktop. Depending on your operating system, it will be called “Picture 1," “Picture 2," etc. Or, if you are using Snow Leopard it will be labeled with a date and time under the name “Screenshot."