The area of client licenses are not automatic with XP Pro. It will drive most nuts as you will soon discover.

http://www.microsoft.com/windowsserver2003/howtobuy/licensing/caloverview.mspx

In a nutshell, CALs were not automatically granted with a copy of XP Pro. You may find it hard to find the old Windows 2000 link/webpage about this but it gave everyone pain as they discovered the awful truth.

Bob