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When I'm lecturing I want the exact same stuff that shows on my MacBook Air's screen to show on the external screen. How do I do that?

For just slides the regular settings are fine, but when I'm coding/compiling/debugging live they are a hassle like no other.

(Ps. would like suggestions for better titles/tags in the comments. Or if your rep is high enough just go ahead and modify whatever you'd like.)

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up vote 1 down vote accepted

You did not specify the OS you are using but in general in the display preferences (System Preferences → Display) you should look for a mirroring option.

Screenshot for Mountain Lion:

enter image description here

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Mountain Lion- thanks. This stuff is too easy on a Mac. –  The Unfun Cat Sep 6 '12 at 9:11
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