How can I prevent Win NT 4.0's signon screen?

I would like to code a small pc security application for my work PC.

I usually code for Win95, 98, ME but never really tried to code for a NT based opperating system before. I have, in the past created a application that loaded as a service process from Window's registry, that effectively covered the entire screen, hiding the logon window and preventing "ctrl,alt, and delete" buttun presses...My code however for Win NT 4.0 and I assume for Win 2000, fails to accomplish the above mentioned acheivements.

I would like to code an application that will effectively cover the entire window, preventing the logoin screen to be seen and disables "Ctrl, Alt, and Delete" button presses in a Nt based opperating system. How can this be acheived, or can someone list some useful URL's that explain this procces.

You can't unless you use TweakUI. You would also be causing a major security breach, because TweakUI automatically logs in the user of your choice. NT is designed against this. :)

You can't write a program like that for NT unless you outsmart the designers and programmers who made the thing. It is indeed designed against that sort of thing.

Darn that truley "sucks", pardon my french, heh. Sometimes another employee logs into my box and as their account granted but they have a tendency to make adjustments to windows and move my desktop belongings to their needs. I was hoping by coding this application, that I would prevent their usage of my Pc, period and that would ultimately discourage their usage of my desk. heh

I'm not sure but I think there is a way to disable network log-ons (other users) from accessing your pc without disabeling network functions (printing, email, etc). I reserve the right to be wrong on this one but you should check it out cause if you can set it so that only one password works, then others wont be able to use it. Also, you could make the program you described above and make it come up after the logon dialogue. This way, they might realize that even though they can log on, they cant do anything. Again i reserve the right to be wrong.