[FreeNX-kNX] Can I keep suspended sessions running?

[Sascha Sponholz]

Surely it has been asked before, but I am unable to find the answer 
anywhere:

Is it possible to connect to an NX server, start a GUI application (for 
example a raytracing software),
disconnect, and reconnect later on to see if the application has 
finished its job?

By now I have successfully created a new session, suspended and 
reconnected to it,
but it only worked correctly if I have been disconnected for a short 
amount of time.
I think that the session did not continue to work in my absence but just 
paused
and waited for me to reconnect.

Currently I use VNC to achieve my goals, but this is slow.
Will FreeNX be able to do what I need? Is it already possible?

Cheers
Sascha Sponholz