IF you baught an operating system.

and you have about 3 computers @ home.
could i register all of them? and go on the internet on both of them?
Will it be ligegale or iligale ?



For EX. those chickens that are letting us upload there files in kazaa like operating systems,
lets say you downloaded Xp pro and got a serial w/ it and could I register it?
I will that be illegal?



Thankxs I must be allitle stupid but I'm learning
and sorry for spelling.