hitting the windows key ( flag key ) & the L key, locks the screen & hitting said keys again unlocks the screen again. The same as Ctl/Alt/Del and clicking on the "lock" button, just in fewer steps.
More here:
http://support.microsoft.com/kb/294317
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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