IMac display with second computer?

Is anyone driving the 27" iMac display with a second computer?  If so, can you switch between the iMac and the second computer to see what is happening on each machine?

Yes you are.  The two machines I use are mini displayport.  Thunderbolt must hook to Thunderbolt.  I wasn't thinking of the new iMac 27".   Old timers moment.
Captfred

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    Hi,
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    Ah, cheers for the info.
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    I guess that's a Dell laptop...?
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    Here's a clever application that uses the open source VNC protocol in a creative way.
    http://www.screenrecycler.com/home.html
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    HI and Welcome to Apple Discussions...
    Try Resetting the PRAM
    If that doesn't make a difference, might be a good idea to run the Apple Hardware Test
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    Most of the 24 inch LCD have multiple video inputs, which means you can get connect two different video source (i.e. desktop, laptop) to the same display, and then switch between with only a few button presses.
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    Hello, 
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    A video-in device. A device like Elgato's EyeTV Hybrid (link) would not be of sufficiently high resolution to be any use for video editing/detailed work.
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