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Lock is a free program which sits in your system tray of your Windows desktop. When the icon is clicked your desktop is hidden and locked with a small customizable password window. The password window can be a specified color of can be set to random. The window can also be set to randomly travel around the screen. To change any setting, as well as quit the tray icon and change your password: right click on the tray icon and click on 'Admin'. The password is blank by default.

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