Launch201 is correct, what you're asking for is to be able to use 2 physical computers simultaneously as 1 - this is not possible - your best option would be to run remote desktop on 1 PC with dual monitors, and have remote desktop running in full screen mode on the second monitor - you'd at least then be able to use monitor 1 to manipulate the one PC and monitor 2 to manipulate the 2nd PC with the same keyboard and mouse and see both at the same time. You cannot use the two computer's processors/memory/etc as 1 PC though - thats called clustering, and can only be done with advanced operating systems and hardware. (Windows Server 2008 Enterprise Edition or Data Center Edition would do this with the correct hardware).