You need a TV/video card. This is a PCI or AGP slot card with TV inputs. The higher end cards also have pure A/V and S-video inputs. Or you can get a USB unit. Do a search at any good web computer store and search for tuner cards.
Some cards come with software to turn your PC into a Tivo using the HD as storage and all the bells and whistles. With a CD or DVD burner you can burn what you watch to optical media.
Telephony facts, analog/digital explained.
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What I mean is, can I connect a dvd player to my pc so i can watch with the monitor instead of a tv screen?
I once saw a pc playing dvd movies using a dvd player (not dvd rom drive) Do I need a special kind of monitor or adapter?