Windows settings for App

I created an application that does teleconferencing, like Messenger works. My customer wants to have ONLY that application to come up when the machine is started. He does not want the customer to see anything else but this application. The reason is because it will be used in a hospital and it works on a touch screen machine.
Anyway, I know it can be done; I just don't know where or how to set up Windows to do that. Any pointers, links or explanation will be greatly appreciated.
Thanks!

I know that it can be done in Windows 2000. They demo'ed JOE LOCKOUT, the troublesome user that gets to see only one app. he can do nothing besides the app, and logout.

OK, was that a Microsoft demo? Where do I see that?