[Nomad84]

All I know is that a friend of mine has installed her copy of XP Home on more than one machine at once. I think it's on several. I borrowed it, but I was the lucky on that pushed that key over the limit. It's an old copy from shortly after it came out, so it's possible that there is a limit of perhaps once per year or something like that, I suppose. I'm not really sure what the actual policy is, but I do know that this copy was installed on more than one machine.