> I noticed the sticker on the XP Professional cd packaging says "Windows XP
> Professional - 2 CPUs". Does that mean it can be installed on two PCs? Or
> does it mean it can support 2 CPUs on one PC?
>
> Thanks in advance!

means it supports multi CPU systems
multi CPU as in 2 physical processors who in turn can be multi core
and/or multi threaded

so you could come to a total of 8 logical CPU's, isn't that something
;-)

grtz