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Tuesday, August 13, 2019

What does CTRL-ALT-DEL actually do, when at the BIOS screen?

What does CTRL-ALT-DEL actually do, when at the BIOS screen?

  • Sends an interrupt 999 to the CPU
  • Sends an interrupt 0 to the CPU
  • Sends an interrupt 443 to the CPU
  • Sends an interrupt 9 to the CPU 

EXPLANATION

If Ctrl+Alt+Del is executed before Windows is to a point where it can intercept the command, BIOS will simply restart the computer. Ctrl+Alt+Del might also restart the computer while in Windows if Windows is locked up in a certain way. For example, using Ctrl+Alt+Del during the Power On Self Test reboots the computer.
In Windows 3.x and 9x, if Ctrl+Alt+Del is quickly pressed twice in a row, the system will immediately start a reboot without safely shutting down any open programs or processes. The page cache is flushed and any volumes are safely unmounted, but there isn't an opportunity to cleanly shut down running programs or save any work.

 

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