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That's because I don't want to move the windows one by one to the big display, or accidentally move the mouse cursor over to the Macbook's display and not know where it is.

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up vote 1 down vote accepted

Close the MacBook. If a mouse and keyboard are connected, you can wake it up and only use the external display.

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Bonus Info: Some have a problem with heat buildup, others don't want to use external mouse and keyboard, but there is no other way than this. – Daniel Beck Oct 23 '10 at 11:41
    
wow, the only way is by something physical, not by software! – 太極者無極而生 Oct 24 '10 at 16:24

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