How to superimpose a chat (an IRC chat basically) on my TV signal?

I would like to be able to watch TV with a chat (an IRC chat, basically) superimposed on it.

I was thinking if there was anyway I could have a PC do that superimposition with some sort of video card to interface with SCART cables and a simple piece of code on my PC that would do the trick. Any ideas?
alexanddAsked:
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CallandorCommented:
You need a piece of broadcast equipment to do an overlay: http://colorado-video.com/products.html

Alternatively, use a TV with Picture-in-a-picture and feed the chat into the smaller box - it will expect an RF signal.  You can also install a TV tuner into a PC and use your TV as a monitor.
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