Can I turn darken my MacBook display while I use a Cinema Display?

I have purchased a Cinema Display and external keyboard. I have tried to figure out how my MacBook display can be asleep while I use the Cinema display--I'm stuck!

<http://support.apple.com/kb/ht3131>

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Dear All,
I am connecting my Mac to TV 32'' via mini display port converted to HDMI.
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Boudy,

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Can I turn darken my MacBook display while I use a Cinema Display?

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