Okay, so it’s an “oldie” but still a “goodie”.
If you work on your PC in a multiple-person environment and need to nip away from your machine to make a cup of tea, visit the loo or indeed anything that takes you out of line-of-sight, it’s often a good idea to lock your computer so that “friends” can’t use your PC to post embarrassing stuff on your Facebook account. Or worse.
If you’re using windows, simply Hold the windows key (the key in the bottom right of the keyboard between CRTL and ALT, with an image of Windows) then press “L” for “LOCK”.
Hey presto, anyone will need to enter your password to use your computer again (if you’ve set up a password that is).