How to turn off screen while computer is on an hdmi tv/projector hook up

How to turn off screen while computer is on an hdmi tv/projector hook up?

Have you tried Clamshell Mode?
http://support.apple.com/kb/ht3131
Ciao.

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    Have you tried Clamshell Mode?
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    Have you tried Clamshell Mode?
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    Hello
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    But it can be programatically. Not only by OS... I thought Toshiba had an utility software for this.
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    Wow.  That was a super-fast answer.  Thanks.  I had seen that optoin and foolishly hadn't tried it because I thought typing my passcode there was just another way to put it into passcode lockdown "immediately".  Well, I said I was stupid. Thanks, it does now work the way it used to and I can still have it require the passcode after a certain timeout period.
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