How do I put an external display to sleep when I am using my MacBook Air for presentation?

How do I put an external display to sleep when I am using my MacBook Air for presentation? I do not want to go to the projector just to turn it off and turn on again after a while? Is there a keyboard shortcut for that?

I want to be able to sleep the external display and at the same time do things in the MacBook.( This feature is useful for me so that I can prepare some things and so that my audience will not see what I am about to show them.)
Is there a feature for Mountain Lion?

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