Microsoft had no need to ask IBM to put a special button on keyboards for this. On both versions pressing CTRL-ALT-DELETE for a second time would cause the computer to reboot.) With Windows 3.1 it would bring up a screen where you could kill the currently running task, while on Windows 95, and 98 and ME, it would bring up screen where you could select a task to kill. (MS-DOS-based versions of Windows had a different and partial repurposing of CTRL-ALT-DELETE. So they repurposed the CTRL-ALT-DELETE as a special key combination that no application could intercept and that would always bring up a secure screen that users could trust. On the other hand, they needed some way for users to be able to securely login with their username and password without having to worry about being fooled by some program that displayed a fake login screen. Microsoft considered allowing users to easily reboot the their computers with a simple key stroke combination like this undesirable. The use CTRL-ALT-DELETE as a "secure attention" key was first implemented in Windows NT. This was implemented by the BIOS, so any operating system, like MS-DOS, that used the BIOS services would get this behaviour unless they did something to change or disable it. The original IBM PC used this key sequence to reboot the computer, in case the computer crashed or the user just wanted to boot some other operating system or application. No, CTRL-ALT-DELETE was a thing before there were tasks to manage.
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