How do you sync macbook air to overhead VGA projector?

How do you sync a macbook air to overhead VGA projector for slide presentation?

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That depends on the set up of the projector.
What input does the projector support? Older projectors often had VGA, S-video or RCA composit video inputs. Newer ones might have HDMI or a LAN cable, some of the newest are AirPlay compatible. 
Once you have determined what connector you must (or can choose) to use you pick one and open System Preferences Displays... the MBA should be detecting and showing a second monitor... your projector should be detecting and showing a input signal.  You just have to match them up resolution and refresh rate wise.
Say the projector has a resolution of 800x600. Compared with MBA's 1366x768 resolution, if you simply have it mirror the MBA, its screen is going to shrink to the point where it is more difficult to run apps (especially if you select them from the top toolbar, as everything is squashed together).
Conversely, if you choose to use the projector as a 2nd screen, it preserves the MBA's original resolution, and only affects any app drug off-screen (which is what the students will see). You will still have the main desktop available for apps to keep open (but don't want the students to see).

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