> What Jacob wants to do is login to his desktop locally via XDM, GDM,
KDM,
> etc., do some work, walk away from it, and then resume where he left off

> from another machine via VNC.  Or, he wants to allow users to login to
the
> machine and if they have problems when he is not nearby he can remote
> control the user's current session via VNC --- similar to NetMeetings
> remote control features.  What your describing will not work.
>

Take a look at the tightvnc website.  I seem to remember that question
being in their faq and they had a pointer to a solution (maybe a fork of
VNC)?