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Control-Alt-Delete (often abbreviated to Ctrl+Alt+Del, also known as the "three-finger salute")〔〔〔 is a computer keyboard command on IBM PC compatible computers, invoked by pressing the Delete key while holding the Control and Alt keys: . The function of the key combination differs depending on the context but it generally interrupts or facilitates interrupting a function. For instance, in pre-boot environment (before an operating system starts)〔〔〔 or in DOS, Windows 3.0 and earlier versions of Windows or OS/2, the key combination reboots the computer. Starting with Windows 3.1, the command invokes a task manager or security related component that facilitates ending a Windows session. == History == The soft reboot function via keyboard was originally designed by David Bradley.〔 Bradley, as the chief engineer of the IBM PC project and developer of the machine's ROM-BIOS, had originally used ,〔 but found it was too easy to bump the left side of the keyboard and reboot the computer accidentally. According to his own account, Hallerman, who was the chief programmer of the project, therefore suggested switching the key combination to as a safety measure, a combination impossible to press with just one hand on the original IBM PC keyboard.〔〔 The feature was originally conceived only as an Easter egg for internal use and not intended to be used by end users, as it triggered the reboot without warning or further confirmation—it was meant to be used by people writing programs or documentation, so that they could reboot their computers without powering them down. Bill Gates (former Microsoft CEO) remembered it as "just something we were using in development and it wouldn't be available elsewhere".〔 The feature, however, was detailed in IBM's technical reference documentation〔 to the original PC and thereby revealed to the general public. Bradley 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."〔 Bradley is also known for his good-natured jab at Gates at the celebration of the 20th anniversary of IBM PC: "I may have invented it, but Bill made it famous"; he quickly added it was a reference to Windows NT logon procedures ("Press Ctrl + Alt + Delete to log on").〔 During 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 in to 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.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Control-Alt-Delete」の詳細全文を読む スポンサード リンク
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