Apple TV as computer display?

I want to show my computer screen on a 46" 1080p display while others watch me work with mapping programs to plan trips. I put a marker on the map on my computer, it shows on the 46". I think Apple TV cannot do this because what I am showing does not go through iTunes.
As a work around, it possible to post maps to iDisk in Mobileme and use Apple TV to show them? (Panasonic plasma TV)

Thanks for a prompt, clear answer. It's time for more cables and adaptors!
My interest is more in displaying content generated in our home rather than externally downloaded. I was hoping the device might replace wires and adaptors and allow three computers to wirelessly display any local based computer content. It seems Apple TV can handle the iPhoto library in one machine at a time but does not retain computer settings to allow for easy toggling between two or more computers.

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I don't think it's exactly an incomplete installation brody, but most likely in-correct permissions somewhere along the line that either happened, or became magnified during the upgrade. Also, it could be corruption as well.
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If I have 2 tv's and each their own apple tv can I display the same program to them from my macbook at the same time?

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for instance Keynote?

Welcome to the Apple community.
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Just a correction and an elaboration:
It should be Startup Disk... with a k, not a c.
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Extension cable for Apple 24" LED Cinema Display

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There is a snag. The cable on the monitor is too short to reach my computer, which needs to go under the desk. The cable on the display is hard wired. I would prefer not to drill a new hole in the desk if I can avoid it.
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It is around two feet long. I would not have a problem with this if I could extend it or Apple had adopted the standard cable with female connector on the display so I could purchase a longer cable. Apple has a long history of slipping into proprietary solutions that are often good (e.g., magsafe on MacBook) but tend to cramp ones ability to come up with solutions they have not thought of.
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I hope everything is having a good weekend. I have been trying to find an answer and no avail I am not able to find any solid answer.
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2011 MacBook Pro 15" (MacBookPro8,2 model)
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Apple TV as computer display?

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