Gates calls Ctrl+Alt+Del command a mistake

Originally designed to trigger a reboot of a PC, it survives in the Windows 8 operating system as the command to access the task manager toolbar and is still used in older versions to log on.

In an interview, the Microsoft co-founder blamed IBM for the shortcut, saying he had favoured a single button.

The keyboard shortcut was invented by IBM engineer David Bradley.

Originally he had favoured Ctrl+Alt+Esc, but he found it was too easy to bump the left side of the keyboard and reboot the computer accidentally so switched to Ctrl+Alt+Del because it was difficult to press with just one hand.

During IBM's 20th anniversary celebrations, he said that while he may have invented it, Bill Gates made it famous.

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