Hi, I am just getting into the HD scene. I bought a philips 60 inch widescreen HDTV. The directv men are coming in about a week to install the hdtv sattelite and reciever. I also am getting an antenna for ota hdtv programing. I was looking at my tv manual and it says to connect a hdtv reciever, I must connect the component cables (or dvi), coaxial, and necessary audio cable. It also says to connect the s video cable. I do not understand why the s-video cable must be connected? Also I was wondering if I connect a dvi cable do I use single link or dual link. What is the difference?