My kids are driving me a bit crazy: they keep opening up my MacBook Pro and messing around with it, even when I tell them not to. Since I can't hover over it like an eagle, I need a software solution: how do I require a password to be typed in - to password protect the computer - on either wake from sleep or going from a screen saver to the regular desktop on Mac...

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How can I change the picture on the background of my Mac? I know it's probably easy, but I have no clue....

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