Fast Desktop Extender is a handy utility which allows you to switch between normal and extended desktops with a single click.

First, you must configure your extended desktop so start the program and set the appropriate parameters of your monitors (width, height, bits per pixel, frequency).

You can also set the direction of the extension according to your monitor's position on your desk. You can try your settings: check the checkbox to enable Extended desktop and uncheck to disable it. If you are satisfied with your settings make a shortcut on your desktop and in the target field give the " -load" string as a command line parameter.

Now you can enable and disable extended desktop with a single click.