Can one sleep main screen with miniDP to HDMI from 27"?

Is it possible to sleep or otherwise disable the main screen on the 27" iMac while outputting via DP or miniDVI to HDMI, if so, how? I have not been able to do similar with the 24", so I was hoping this was now possible.
Thx.

As far as I know, this is only possible if you use an app such as Front Row to view multimedia, which should do it automatically, or if a particular app has it as a specific built in configuration.
Dah•veed

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