Computer screen on, Projector off
If you are running Windows 7\8:
Leave the ViewSonic projector on.
Right click anywhere on the desktop and select "Screen Resolution".
In the display column, it will give you an option to select your computer monitor, the ViewSonic, or to clone the displays.
Select your computer monitor display only.
Shut off the ViewSonic projector.
If you are running Windows XP:
The process is basically the same except you find the settings under Control Panel > Display.
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