[iMore.com]

Most of the time you want to be alerted when something happens on your Mac — when it's time for an appointment, say, or if you get an important e-mail, when the web sites you're interested in have new headlines to read, or when apps need your attention. But other times you want your Mac to stay quiet, and that's where Do Not Disturb comes into play. Here's how it works, how to activate it, and how to make it easier to use with a keyboard shortcut.

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