yes, tv's can be used as computer monitors with the appropriate graphics card....and there are quite a few monitor-tv combos but i cant remember their names
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Nope without a Video Capture card or a TV Tuner you can't watch TV on your Monitor.But you can do the opposite i.e. use your TV as Monitor using the S-Video out provided by your G-Card.
To use Monitor as TV buy a Cheap External/Internal TV Tuner Card !!