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I have external monitor in work and I want to mirror MacBook's screen on it while I have the internal display turned off. But I found this as impossible task. I know I could close the display and attach a keyboard but I want to use MacBook's keyboard (and let the computer breathe through it).

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    You can just turn the brightness all the way down – 0942v8653 Nov 27 '15 at 15:08
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    I know but this is not solution. I have MacBook Air and turning brightness down is not good for books performance. It's little bit more heating and sometimes has slower reaction. – Lachtan Nov 27 '15 at 15:10