CTRL + ALT + DEL Disable

[TmC]

Hi everyone,
long time no post, but going from university to work has been hard.

Today I'm asking some hints to solve a problem with an application I am currently developing:

I am actually working on an application that will be installed in a museum environment.
This program will run on a machine that is not an embedded machine, but has to work like a normal PC, with keyboard and mouse.
When the application is started, by personnel intervention, the application runs full-screen and will be used by visitors.

This requires some security measures, like disabling with all means, the possibility that the user could use the pc other than the application itself. I have thus disabled with hooking code all special OS codes that could let user exit or minimize the program and use the pc. (ALT+F4, ALT+TAB, WIN KEY, CTRL+SHIFT+ESC etc etc).

This works great EXCEPT for CTRL+ALT+DEL.

Doing some internet researches pointed that CTRL+ALT+DEL is a SAS sequence and can't be trapped by programs since it is a security feature and so it can't be disabled.

In Windows, CTRL+ALT+DEL wakes up the login screen, giving the user the possibility to reboot, shut-down, start the task manager (Killing the application) and so on...

The problem is mainly that the PC needs to have a keyboard connected to it so anyone can hit the SAS sequence and go into the PC.

So here is the question: how can I disable CTRL+ALT+CANC only when the application is run and restore the normal behaviour when the pc is used as a normal PC by the personnel?

Is really the only option left to write a filter driver that checks if Application.exe is running and filters silently any CTRL+ALT+DEL requests?

Thanks in advance.