the balun what Detale said use is the best bet then,you would have a balun coming out of your pc video/sound, plug a cat 5 into it,then plug the other balun into your tv with the other end of the cat 5.
As far as remotely changing channels on another pc,use logmein/vnc/cygwin with openssh remote desktop,just to name a few, and then just log onto your pc and do you stuff.
We will get you there in the end
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