Anyone recommend any programs or sites to run multiple OS's on paritions or seperate HD's? Is there a good knowledge base about doing this? What and how to? Can a person put an OS onto an external drive and run it? I would assume yes. How sucessful is a different story though. Apparently there are two boot-ups or something? I was told about this at work by someone. Does the start-up when you turn on your computer just take longer? Can you run them at the same time and switch between them with ease? Or do you need to shut-down and log-in on the other?