to BC, aussieoak.
Okay, I understand what you're trying to do.
You have access to your satellite's signal on your desktop and you can watch TV on it. I assume you have a TV tuner card of some kind installed.
You have a laptop that is connected to the same network, and you want to be able to use the same satellite signal and watch TV, as well.
Well, there are only two ways that can happen, that I know of.
The first being that you install a TV tuner card on your laptop and hook up the satellite cable to it. This would obviously tether you to the length of the cable, but it does work.
Your second option would be to do a Remote Desktop Connection (RDC) from the laptop into the desktop, giving you control over the desktop whilst sitting at the laptop. Remote Desktop Connection : frequently asked questions
You would be able to see what's on the desktop's screen (i.e. the TV show(s) playing in Windows Media Center, or whatever program you want to run).
This, however, is a most inelegant option due to the fact that RDC has poor performance as far as graphics and such go.
This may or may not work for you. I got an error message trying to watch a Netflix movie over an RDC. It shut Windows Media Center down. I don't know if it will do the same for live TV or not. You can try, but I make no guarantees.
Personally, I would go with option 1. Or just watch Internet TV
on the laptop instead of live TV.