Is there any way to stop the output of the iMac display to a connected TV?

I just bought an iMac 21.5 and successfully connected it to my plasma HDTV using a Mini Displayport to HDMI adaptor and HDMI cables.
Ideally, I would like to have the HDTV set up as a second display for watching movies, rather than mirroring the two displays. However, if I set the iMac video output in this configuration, it seems like it permanently keeps the 2nd display on, even when my TV is turned off. As a result, some of the functions I have on (such as triggering Expose) when I scroll to the corners of my display stop working, unless I change mirroring on, or if I physically disconnect the HDMI cable from the iMac.
My question is - Is there any way in software to disable the video output to Minidisplayport (instead of mirroring, or disconnecting the cables)?
If it turns out that Mirroring is the only way to solve this, my question would be - does turning out mirroring affect the main iMac LED display in any way?

Hi,
Did you check  spool requests -> SP02.Could you elaborate on how you came to the conclusion that it wasnt sucessfull?

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