Need Help Installing HP Thin Client

I've bought a HP Thin Client (will provide specs later today) and I'd like to connect it to Windows Multipoint Server 2012. Currently I have Wise Zero Clients connected and they are working nicely. I don't know how to boot the operating system over LAN. Btw, the client has a basic Windows XP which I could start before, but in my attempts to mount the client, I changed the name of the network and now I can't log into Windows because it asks for the administrator's password. If it's not possible to mount this client onto Win MPS 2012, I am open for some other solutions as well. I would like to pay for 1 hour of your time. Thank you.