One license, one computer, the way it has always been with all
Microsoft consumer OSs.
If you want Windows on another computer, you need to buy a second
copy.

--
Jupiter Jones  [MVP]
An easier way to read newsgroup messages:
http://www.microsoft.com/windowsxp/pro/using/newsgroups/setup.asp
http://dts-l.org/index.html

First, if it came with your new one it might not even install on the old one
since often these setups are bios locked to the original computer on which
they were installed.

Second, aside from it being prohibited in the EULA (End User License
Agreement), assuming it does install, XP will cease to function after thirty
days as you will be unable to activate it on the old computer.  You will
receive message that XP is already activated on another computer and the
system will not allow you to activate.
--
Michael Solomon MS-MVP
Windows Shell/User
Backup is a PC User's Best Friend
DTS-L.Org: http://www.dts-l.org/