AltDesk 

AltDesk is a virtual desktops' manager for Windows 9x/NT/Me/2000/XP. With this small application you can create numerous virtual desktops, saving screen space and adding more functionality to your computer.
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Cool Desk 

Cool Desk is a virtual desktop manager. Ever wish to have several screens on your computer? Cool Desk creates up to 9 virtual desktops and allows you to have different windows in each of them.
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