How to mirror iMac screen wirelessly through a mac mini connected to an hdmi port of HD TV?

I have a new Mac Mini connected to a Sony HD TV. On the same network but in a different room I have my iMac. I can control the iMac with wireless mouse and keyboard from the same room where the TV and Mac Mini reside. I would like to work on my iMac but use the HD TV as my monitor so I can show slideshows and iMovie projects without transferring files to the MacMini first. Is it possible, and if so, how do I go about setting it up?

Your iMac likely supports a higher resolution than the TV does. The maximum standard TVs today use is 1920x1080, and if your iMac is an Intel Core i3 or i5, its own display is at least that high of a resolution. Which model of iMac do you have?
If your iMac is running at least Leopard (10.5), then both machines have Screen Sharing built in. It can be accessed from the Finder, but as often as you would like to use it you should go to Macintosh HD > System > Library > CoreServices and drag it (the icon) to your Dock. That will create the shortcut to get to it easily. As I noted before, the built in Screen Sharing VNC software doesn't do full screen, but third party VNC software can. Both machines do not need to be using the thrid party VNC software, just the one viewing - in this case your Mac mini. Chicken of the VNC is a popular free one, fairly easy to use:
http://sourceforge.net/projects/cotvnc/
For more info about how to set up Screen Sharing and how to use the included application:
http://mac.appstorm.net/how-to/os-x/using-screen-sharing-in-os-x-leopard/
Note that you will have to use the settings in System Preferences, regardless of what VNC software you use. Both systems will need to have Screen Sharing settings enabled.

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How to mirror iMac screen wirelessly through a mac mini connected to an hdmi port of HD TV?

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