Imac-external Display only possible?

Hi, is there any way to either use the Imac display or an external monitor/ beamer with a current Imac?
I would like to use the internal display if I use the Imac for music etc but would like to play games via a beamer. I would like to have the graphics card running only the beamer, like a macbook would do in clamshell mode. Is there any way to do this? Maybe it is already build in, but I do not know
Thanks,
Raller

I just found this:
http://www.everymac.com/systems/apple/imac/stats/imacg5_1.917.html
and then under: 2. display support: you'll find this link:
http://www.rutemoeller.com/mp/ibook/supportlist_e.html
i'll try it as well
good luck

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