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Why the Beep?...

▪ Why the Beep brings up an explanation of why the front end produced a beep.
▪ Mathematica beeps whenever you try to do something it can't do or doesn't understand. Choosing this command explains the problem. No matter how many actions you have performed since the beep, the message only concerns the last time Mathematica beeped, and it also tells you how long ago the beep occurred.
▪ Keyboard shortcuts: H ; H H