Is there a way to restrict how many Xvnc processes user can start on single 
Linux node?

If yes, what configuration parameter that should be changed to:
1) check for the presense of the Xvnc process already running as user before 
starting a new one,
2) if such process is found, report back with message like "Running VNC server 

One vncserver per user/per node is enough for our environment since all nodes 
are the same. The reason for this restriction is that VNC with Gnome eats up 
resources. Therefore, ideally we would like to limit the number of Xvnc 
processes that one can start, and not see 'vnclicense -check' return 5 desktops 
for the same user like below.
$ vnclicense -check
4/30 desktops.
  user1 : 1 desktops.
  user2 : 5 desktops.
  user3 : 1 desktops.
  user4 : 1 desktops.

We re running VNC(r) Server Enterprise Edition E4.5.4 (r41964) on a multinode 
Linux cluster. Our vncserver code is a binary.

Thank you,

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