Projector with my macbook pro?

I have a newer Macbook pro that I want to hook up to a projector. I can hook it up, and I can see a display, BUT my wallpaper keeps changing and I don't know how to navigate back and forth between screen displays easily. Is there a quick key or something to do it? My old macbook had one button that would switch back and forth between the two screens.

Hey biddily,
Thanks for the question. The following resource provides some great information if you are having trouble with an external display or projector:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
http://support.apple.com/en-us/HT201177
Thanks,
Matt M.

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Projector with my macbook pro?

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