Turning off an external monitor shortcut key

is there a shortcut key-combo that will turn off the output to a video display so I can open different powerpoint shows without the audience seeing me doing so?
iBook 14" G4   Mac OS X (10.4.5)  

It was for a 120 plate fundraising dinner and the projectors are big and can't be controlled by remote due to their location in the projection booth...bad design, but nothing I could do about it. I ended up clearing my desktop of all but the icons for the PPTs and using a relevant picture for my wallpaper. Thanks for your answers though.

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