Greetings --
As it has *always* been with *all* Microsoft operating systems,
it's necessary (to be in compliance with both the EULA and copyright
laws, if not technically) to purchase one WinXP license for each
computer on which it is installed. The only way in which WinXP
licensing differs from that of earlier versions of Windows is that
Microsoft has finally added a copy protection and anti-theft
mechanism, Product Activation, to prevent (or at least make more
difficult) the sort of multiple installations you're asking about.
Additional Licenses for Windows XP Home Edition
http://www.microsoft.com/windowsxp/home/howtobuy/addlic.asp
Additional Licenses for Windows XP Professional
http://www.microsoft.com/windowsxp/pro/howtobuy/addlic.asp
Bruce Chambers
--
Help us help you:
You can have peace. Or you can have freedom. Don't ever count on
having both at once. -- RAH