![]() The feature, however, was detailed in IBM's technical reference documentation to the original PC and thereby revealed to the general public. Īradley is also known for his good-natured jab at Gates at the celebration of the 20th anniversary of the IBM PC on Augat The Tech Museum: īradley viewed this work as just one small task out of many: "It was five minutes, 10 minutes of activity, and then I moved on to the next of the 100 things that needed to get done." In a March 2018 email, one of Bradley's co-workers confirmed the command was invented in 1981 in Boca Raton, Florida. I may have invented it, but I think Bill made it famous." he quickly added it was a reference to Windows NT logon procedures ("Press Ctrl + Alt + Delete to log on"). ĭuring a question and answer presentation on 21 September 2013, Gates said "it was a mistake", referring to the decision to use Ctrl+Alt+Del as the keyboard combination to log into Windows. Gates stated he would have preferred a single button to trigger the same actions, but could not get IBM to add the extra button into the keyboard layout. BIOS īy default, when the operating system is running in real mode (or in a pre-boot environment, when no operating system is started yet), this keystroke combination is intercepted by the BIOS. The BIOS reacts by performing a soft reboot (also known as a warm reboot). Windows DOS-based Windows Ĭlose Program dialog box, seen in Windows 9x Įxamples of such operating systems include DOS, Windows 3.0 in Standard Mode as well as earlier versions of Windows. In Windows 9x and Windows 3.0 running in 386 Enhanced mode, the keystroke combination is recognized by the Windows keyboard device driver. Windows 3.1x displays a blue screen that allows the user to press Enter to end a task that has stopped responding to the system (if such a task exists) or press Control+Alt+Delete again to perform a soft reboot.Īccording to the value of the LocalReboot option in the section of system.ini, Windows performs one of several actions in response. ![]() Windows 9x temporarily halts the entire system and displays the Close Program dialog box, a window which lists currently running processes and allows the user to end them (by force, if necessary).The text of this rudimentary task manager was written by Steve Ballmer. The user can press Control+Alt+Delete again to perform a soft reboot. If LocalReboot=Off, Windows performs a soft reboot. Winlogon, a core component of the operating system, responds to the key combination in the following scenarios: The Windows NT family of operating system, whose members do not have "NT" in their names since Windows 2000, reserve Ctrl+Alt+Delete for the operating system itself. Invoking Windows Security When a user is logged onto a Windows computer, pressing Ctrl+Alt+Delete invokes Windows Security. It is a graphical user interface that allows user to lock the system, switch user, log off, change the password, invoke Windows Task Manager, or end the Windows session by shutting down, rebooting or putting the computer into sleep or hibernation clicking "Cancel" or pressing the Escape key returns the user to where they were. The key combination always invokes Windows Security in all versions and editions of Windows NT family except Windows XP. ![]() (See below.) Prior to Windows Vista, Windows Security was a dialog box, did not allow user switching and showed the logon date and time, name of user account into which the user has logged on and the computer name. ![]() Starting with Windows Vista, Windows Security became full-screen.
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