Essentially, it creates an OpenGL context on the host OS (Linux or Windows), a virtual 3D device on the guest OS, provides a DirectX to OpenGL translator and a WGL to XGL passthrough (think Wine) - giving the guest OS accelerated OpenGL and DirectX capabilities. DirectX acceleration is available in VirtualBox (this is not the case with VirtualPC), but it is experimental.
Linux has no EULA (only the GPL, which essentially says 'use at will') so you can use the former OEM OS (presumably Win XP - lower-end Vista have EULA limitations) in a VM, IF KEPT ON THAT 'REAL' MACHINE.
Moreover, if you happen to install an 'update' version of Windows, you lose the right to install both the older and newer OS on the machine (check EULA) - so you'd need to spring for a 'full' version of either. Say, the one that came with the computer you converted to Linux. the article does state that you need a valid XP install media - meaning, that you should have a Windows XP license with it. The complete lack of design in 7 just can't be made up by eye candy alone substance is more then skin deep. 7 is also less customizable and for those who aren't politically ignorant can you spot the communist propaganda? Even the 7 ads are stuffed full of it.
A critical aspect of design is consistency which was thrown out the door, where is the My Documents folder? Sure there is an equivelent but changing what it's call is like telling people to call their CPU's "fuzzles" without any justification.and just like Vista you STILL can not move the ENTIRE My Documents folder so if you're keen enough to NOT put your personal/work files on the same drive/partition as the OS you'll still have to deal with programs automatically generating folders on C:\ so you'll need to manually move each folder for EVERY program every time otherwise you're looking at losing 30-50 hours of saved game files PER game. The UI requires two to three more times the clicking (start menu-> programs requires two clicks versus XP's one in example). If they wanted 7 to succeed they should have added Aero and networking improvements to XP but instead they had to reinvent everything and they failed miserably at doing so. Unfortunately Windows 7 is nothing more then Vista glorified and I'm sticking with XP until I figure out which Linux distro to use.
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