I'm looking to use remote desktop to access my backend box.

Looks like I need to enable XDMCP, but the istructions say
1. Enable XDMCP
System->Administration->Login Screen Setup
Tab Security->Enable XDMCP
Tab XDMCP--> You can disable "Honor Indirect Requests"
This menu does not exist in mythbuntu (or am I just blind?)

I have vncserver running and can get a minimal X screen on my windoze machine using tightVNC viewer

Do I need XDMCP enabled? If so, how to do so in mythbuntu?

Is VNC the same/similar to LTSP? Am I on the right track?