MacOSX use only external screen

Hi there, i have a MacBook Pro 15'' and when at home i attach to it my external 24'' screen.
Given that i have a keyboard and mouse attached as well, i would like to completely disable the screen of the mac.

While i could just have all my windows on the big screen i want to use "expose" as if i had only one screen...I know there is a solution for what i want by closing the lid of my macbook but when this happens my macbook overheats.

So how can i disable the screen of my mac book???

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Eoin OSullivanConsultantCommented:
If you close the lid briefly to activate the screen dimming then re-open as described in this article it works

In OSX Lion there seems to be an issue that others have had .. which makes it harder to make the laptop screen go to sleep.  This is a Terminal command to disable the display but it might be too crude for your needs.

There are a few tools to stop the Mac engaging screensaver and sleep mode such as Caffeine or InsomniaX

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