I'm not entirely sure this is the right place for the is question but I cannot think of another so here goes.

In order to login to the windows machines at my office one must press the almighty CTRL-ALT-DELETE command combo first. I, finding this very frustrating, decided to look into why and found claims from both my sys and Microsoft stating that it's a security feature and that "Because only windows could read the CTRL-ALT-DELETE it helped to ensure that an automated program cannot log in.

Now I'm not a master of the windows operating system ( as I generally use *nix ) but I cannot believe that "Only windows can send that signal" bull. It just doesn't sit right.

Is there a good reason for the CTRL-ALT-DELETE to login thing? is it something I'm missing? or is it another example of antiquated legacy security measures?