Can I turn off built in screen??

I have a MacBook Pro 17", and I routinely connect it to an additional Apple 20" screen when at home.
However, I have 1 program that does not like dual screens. In fact, it is a known problem with the program that it will not work correctly with more than 1 screen and it is listed as not something that is going to be corrected any time soon.
Is there a way that I can turn off the internal screen of the MacBook Pro and have just the external running? I have looked, but I don't see anything about how to do that.
I am also scheduled to do a demonstration of this program and would need to use a projector which will also make the program think it is dual screen, so I really need to know if I can turn off the built in screen of the MacBook Pro.
Thanks!

This is the iCal forum. Your question is likely to get a better response from the MacBook Pro forum.

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