Well, if it works like it does in my house, the line (coaxial cable) from the wall goes into the cable box BUT that line will also work fine plugged into a coaxial port on a TV, it just will not have the advanced functions provided by the box (digital, HD, OnDemand). However, if it does indeed work like this, I think you could put the splitter in between the cable box and the wall, and run half of it to the box and half to the PC. You may get seperate control over the sources then, although I cannot guarantee it. Otherwise, his solution with the card and a TV Tuner is the way to go. It will give you all the functions of a HD cable box without the box, only the card, which then goes into your PC. Your other TV would still have to be plugged into the box to achieve the above described functionality (HD, etc...).