Sure - the HP Thin Clients come pre configured with an agent for it. You install it onto a server and configure DHCP options or DNS entries so that the agent can find the box. At that point they'll register automatically with the server.
From then on, you can perform a variety of tasks from the console. Usual stuff like shutdown, running commands (It's faffy, but works) but also image management. It can do all image management over FTP, so doesn't need PXE or anything hard work