The problem with hp liscence numbers is this:
Any HP within the past five to seven years has the HP recovery partition, which you restore the operating system from. You can also use the information on this partition to create restore disks. However, the restore disks check to see if the computer actually IS an HP - if not just a specific model of hp.
Next, you have the liscence number issues. HP codes will only work with HP software. So you have to boot off of the hp disk, which you can't do. Dell and gateway do the same thing. Their numbers only work with the versions of XP they ship you.
Finally, you have activation. You'll have to activate XP on the seconday computer. Granted this is the easiest part to get by, however, if you try and get updates or access certain online resources, one of your machines will be locked.
So is it possible? yes. Is it worth the hassle? no. Just download one of the SEVERAL illegal copies of you want to go that route. That is... if the computer can even handle XP, which if it didn't ship with it, chances are it wont.
I work in a pc repair shop //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif