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Helpful answers
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Sep 14, 2015 12:18 PM in response to capde777by BobTheFisherman,Open an application and drag its Window over to the projector window. You likely are using extended display mode so you need to drag the windows you want to display over to the projector.
OS X: How to use multiple displays with your Mac in Mountain Lion and earlier - Apple Support
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Sep 14, 2015 12:41 PM in response to BobTheFishermanby capde777,Thanks Bob. I tried what you said but in the screen preferences menu only the option "screen" and "colour" appeared. The "arrangement" tab did not appear. May this be problem of the adapter?