Sorry, I know the subject sucks, but I didn't know what to call it...

Anyway, here's my situation:
I have an app requiring X running on my mythbox that I want to access from another computer. Right now, I can vnc to my mythbox to use it, but I have to close mythfrontend to use it (or just bring my app to the foreground, but the point remains, I can't do that while someone is watching tv). So, is there another way to do this? I suspect that what i want is to run my vnc server on a second display, but I don't really understand how the concept of displays works in linux...

What are you using for your vncserver script? The default for VNC on linux is that it opens/runs in it's own desktop, so that when you vnc into a linux box you are not seeing the users desktop (0), but you are seeing a new desktop (1).
Whatever you do on this desktop is only seen by you, even exiting out of the frontend. That is depending on how your vncserver is setup. Normally it will automatically open this desktop #1. However, it is possible to do it on desktop #0 like windows does.

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ASUS A7N266 Micro-ATX Motherboard
Athlon 2200 processor
512K Kingston PC2100 Memory
MicroAtx Case
2 PVR250's w/remote
eVGA e-GeForce mx4000 (64 Ram with Tv/Out (Svideo))
Lite-on DVD cd-rw combo
120 GB Western Digital

I'm no expert, but I may be able to point you in the right direction. The problem you're having is because vnc forwards the tv out signals rather than opening up another connection to X.

What I think will work for you would be to use putty combined with xming (see instructions on the wiki, think the article is called "remote access from windows" or something). Basically, you'd log in with putty, start your program and xming would display it. This would leave the tv out to display whatever the other person is watching.

In versions prior to R5E50 which include gdm you could start the gdm setup program and enable xdmcp (last tab) and then connect to your box through xming just like remote desktop and without affecting the output to the tv. I haven't figured out how to do it that easily in R5E50 though.

I'm using an older version, so that's why it works for me.. That is good info to know. Is that still true if you set your vncserver to use 5901 (or higher than 0)?

_________________
ASUS A7N266 Micro-ATX Motherboard
Athlon 2200 processor
512K Kingston PC2100 Memory
MicroAtx Case
2 PVR250's w/remote
eVGA e-GeForce mx4000 (64 Ram with Tv/Out (Svideo))
Lite-on DVD cd-rw combo
120 GB Western Digital

VNC will do exactly what you want to do and as was stated before typically is set up that way in Linux however the particular VNC variant (X11vnc I believe) that is included with Knoppmyth is made to share the current desktop. There may be a way to also share a second desktop. If not you could certainly install the standard VNCserver which would do what you want. You would want to make sure that they were listening on different ports however.

Here is a little more info on x11vnc:

http://www.knoppmythwiki.org/index.php?page=x11vncHowTo

Martian

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ABIT NF-M2 nView | Athlon 64 X2 3800+ | 2GB DDR2 800 | HDHomerun | GeForce 6150 (onboard) | WD 640 GB SATA HD | DVD-RW (sata) | StreamZap IR receiver with Logitech Harmony remote

Vizio 37" LCD HDTV (1080p)

Thank you! It sounds like installing the standerd vnc server will be the way to go. Thanks for all your help, I know my post wasnt' the clearest.