Our school has some software doing roughly the same thing
RM Tutor 3.
A class teacher can watch every screen simultaneously, or go remote desktop on the PC and close all the windows. Or shut the PC down remotely, log students off remotely, etc.
You can't boot from a disc, because they've passworded the BIOS (how long until I break it?) and you can't run any applications other than those in the start menu.
Attempting to do so says (badly paraphrased) "This application has been blocked by a software restriction policy. Please contact your system administrator"
And you can't change any settings (supposedly. On some of the PCs they've left the NVIDIA settings panel in the desktop context menu, so I've upped all the PCs to maximum resolution.) and you can't get to the command prompt.
Well, except on the NT4 PCs up in tech...
(After that incident they've kept a close eye on me.)
Oh, and I forgot to mention the web-sense blocking piece of rubbish. Blocks... well... everything. Used to block Microsoft.com under category Marijuana. Well, it would explain a lot.
Oh, and also the anti-virus, set up to scan all the network packets passing through on startup, pulling network speed to roughly 15Kbps, so logins take five minutes on a good day.