Does reloading windows (with the same CD and serial number) actually produce a different computer code?

I've gone on spats where I've formatted+reinstalled windows multiple times in a row, would I have to get a new computer code every time?


I don't see where this limitation would cause much of a problem, sure, you'd have to wait 2 days, but you only have to do it once... it's not that big of a deal. On the other hand, if you're trying to hand the software out to all your friends, it would be a pain, because they may not want to wait 2 days.