Your problem could be much more difficult. -- You're almost cheating by using the wireless controls.
As I see it, this divides into 2 sub-problems:
- Sending the XP video signal (only) over the LAN to the Linux box.
- Getting the Linux box to send the XP video signal on to the HDTV.
To solve 1) you will need an Xclient, yes client not server -- X names things "backwards", on XP. You have an abundance of choices. (Google "windows x client" to see.)
The things to remember in choosing are that you don't need
controls, just the video; & you have a relatively fast connection. BTW, how fast is your LAN? Many of the products are trying to work well over the 'Net not just at DSL speeds, but even on IDSN or even cell phones.
Roughly your choice is between:
- One of the VNC's
- Something else
Perhaps someone w/ experience w/ these will step in w/ some advice. I hope they will remember that your main criteria seem to be ease of installation, use, & maintenance; NOT speed. Let me emphasize:
- Video only.
- LAN speed at least 10Mbps, probably 100.
This article http://www.linuxjournal.com/article/8477
looks like promising background, although I have not read it all & I suspect that 1 of the VNC's, not FreeNX, is the right solution for you.
As for 2), I know it is relatively easy to do -- consider all the 2-headed cards out there. In fact you may have 1 & already know how to use it. I hope so, because I never have had the occasion to use 1, or even 2 cards w' separate outputs. How are you planning to drive the HDTV & do you already know how to do that?