This quick tip has come about recently as I was surfing for the wifes birthday present and I needed to quickly hide the display so she could not see what I was looking at. As this is a laptop like me, I assume that most of you savvy geeks will have a password set on your laptop so as soon as your screen goes to sleep it prompts you for your password, so no-one can easily get back to see what you were doing.
To simply and quickly put your display to sleep, press the following key combination:
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I have tried this on my iMac, and it works on those as well.