Desktop Protection allows you to lock your desktop in one click without logging off your system. If you like to go the bathroom or grab a cup of coffee, all you have to do is to click on a button on the side of the screen, and your desktop is locked.
Then you unlock it again by typing your password. When you lock your desktop you don't have to close your running applications on your computer. It just keeps them hidden until you come and unlock it. This application is very simple and easy to use.
Source : http://download.cnet.com