The company I work for bought new computers with Windows XP and they are all using the same Volume License Key. The serial number shows up as xxxxx-640-xxxxx-xxxxx but when I installed XP on a computer at home and used the same VLK, my serial number shows up as xxxxx-648-xxxxx-xxxxx. I don't really care -- it passes WGA since Its a legitimate VLK. I just thought it was weird.