Windows 95, 98, and Me used Ctrl+Alt+Del for Task Manager. Windows NT, 2000, XP, Vista, 7, etc use Ctrl+Shift+Esc for Task Manager, while Ctrl+Alt+Del was rese

Windows 95, 98, and Me used Ctrl+Alt+Del for Task Manager. Windows NT, 2000, XP, Vista, 7, etc use Ctrl+Shift+Esc for Task Manager, while Ctrl+Alt+Del was reserved for the lockscreen. What was confusing, though, was that Windows XP (and ONLY Windows XP, not 2000 or Vista) in default settings would use Ctrl+Alt+Del for Task Manager, although in domain mode Ctrl+Alt+Del would still open the lockscreen.