Your response has brought up another question: how do you run two operating systems at the same time on the same computer? Have only tried running more than one OS on a single computer recently (a computer with Windows broke down, and some freepers suggested that Linux be used), and to get on Linux, it was selected in the boot menu (although the Puppy Linux desktop did have tab on the bottom with Windows in it (but it didn't work)......). Is it similar to having multiple browser windows open at the same time, and there's some way that toggle between OSs. Curious.
Check out VMware Server. You run the second (or third, or fourth) OS within a VM inside the first OS.