How To Set Picture Size On Tv Computer To Composite TV?

Computer to Composite TV? - how to set picture size on tv

I am now trying on my computer to my TV through an S-video. I connected everything and it works, but I wanted to know if there is a way to have the computer somehow "automatically" the size of the screen and what resolution to set. If you can theres no HDTV card or anything I can to get a clear picture on my TV show, because now the resolution is too big or the screen does not match, or too small and too blurry. I'm curious to know how to work the game consoles like the Xbox, which is more structured than a PC than anything and he knows exactly how the big screen. I wondered whether there a way to display on the screen, while MonitOy-TV. I have an ATI Radeon 1800XT 512MB VGA and composite TV if I decide to turn off the monitor, and vice versa, there are drivers to show that in both?