Short cut to lock the keyboard
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Windows Logo+ L
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ALT+ESC
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F6 key
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ALT+SPACEBAR
A
Correct answer
Explanation
Windows Logo + L is the keyboard shortcut to lock the computer and switch to the login screen. This is a security feature used when stepping away from the computer. ALT+ESC doesn't lock the keyboard. F6 and ALT+SPACEBAR have other functions in Windows.