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Before a talk, I'd like to try the presenter mode for Keynote - to get familiar with it - on my Macbook Pro, without an alternate display being attached.

Is this possible? How?

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up vote 10 down vote accepted

Keynote has this functionality built-in. In Keynote, go to the Play menu, then choose Rehearse Slideshow. You'll then have presenter mode on your single screen.

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Shame on me I couldn't find this on my own. Wondering how many non-native English speakers know the meaning of the term 'rehearse'. – Roberto Aloi Nov 1 '11 at 15:12

I don't have my adapter handy to test this, but you might be able to just plug the adapter in and have the MBP think it has a second monitor.

This definitely doesn't work with the mini display port to DVI adapter, but I seem to recall that it worked with a mini DVI to VGA adapter (or was it the DVI to VGA adapter?).

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