Use an external screen as primary screen while the lid is open

is it possible to use an external screen as primary screen while the lid is open on a white MacBook (Lion)?

I can't get this to work either, and I really want it too!
Noisy fans, and overheating laptops are not a pleasant experience when working next to one all day.
Please apple, at least give us the choice!?!
I presume running two screens rather than one also puts more of a drain on the graphic card.

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