To take a snap shot in your Mac:
1. To take a screen shot of your whole window, press shift, Command and 3 keys at the same time. The image will be stored in your main HD.
2. To take a screen shot of rectangular window, press shift, Command and 4 keys at the same time. You will be see a small curser that allows you to select the area you want a snap shot of. The image will be stored in your main HD.
