A lot of folks were wondering why
Microsoft started using the
ctrl+alt+del keystroke combination to log on to
Windows NT. Pressing these three keys together creates a
hardware interrupt, which would stop any other process displayed on the
monitor. There were folks who were coming out with little
hacks that would
capture login screen names and
passwords by displaying a fake login screen, but these were all defeated by the ctrl+alt+del combo. It added a little bit of
security to the logon process.