Trouble connecting Mac Book w\ Mt Lion to a projector.

I am trying to hook a fairly new Mac Book Pro with Mt. Lion to an external DLP projector.
I followed the manual, turned on the projector then connected to computer.
The Mac recognizes the projector, blinks the computer display then the projector shows my background picture but nothing else, not even the dock. No cursor movement seen through projector.
The only time I got a change was when I opened Keynote, went to preferences, went to Slideshow and hit 'Open Display Preferences'. In that case I get a window through the projector that is different thant the Display Preferences window shown on the screen. It is titled VGA display, show buttons for Resolution and a drop down for Rotation.
I am trying to run a Powerpoint Program with Powerpoint for Mac. Please let me know if there are any additional things I need to do to make that work on the projector. Thanks to anyone who can help.
Arden

You have mirroring disabled in the display settings.
Go into settings/display and select "arrange displays".  There you will see a selection for mirroring (select it).  You will also see a graphic to show the current relationship of the built-in display and the projector.
If you want to keep them separate, just remember that the projector is off to the side of your built-in display.

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