>>>So....can you (in C++) program the Ctrl+Alt+Del key combination to, say, pop-up a sign-in screen?
>>>
>>Joe,
>>
>>Apparently as windows does that.
>
>I am asking if Windows NT allows this...not whether the BIOS allows it...I always thought that NT would not allow trapping the Ctrl-Alt-Del combination so you couldn't program a password-stealing program. I should have been clearer in my question.
>
>Take care,
>Joe

I think NT would make this difficult, if not impossible. A long time ago I was reading about how MS made NT 3.51 C2 secure. One issue that had to be addressed was preventing remote logins i.e. spoofing. MS decided it needed a way to be sure that a login was for real - they chose the Ctrl-Alt-Del keystroke combination, which must come from the local console.

Having said all that, Citrix may have put in a few wrinkles in their WinFrame/MetaFrame product for multi-user support.