you cannot legally copy one operating system to another computer to run the operating system on two computers.
You can make an image of the OS and data using norton ghost or acronis true image or the xp backup app but has to be on the same computer.
When you install xp on the computer you have to register it with Microsoft if you want to put the same OS on another computer you have to register it again. The registration would not complete because it woulod be the same key. YOu would have to contact MS and ask them for a new key and that would cost you money.
Microsoft Certified Professional
compTIA Certified Professional