[PyMOL] Persistent PyMOL pipes? Preventing a call to 'cmd.quit()'.

Hi,

I am the project administrator for the open source program relax
(http://nmr-relax.com or https://gna.org/projects/relax) and am
interested in interfacing relax with PyMOL.  relax is a program for
studying the dynamics of proteins, RNA, or other organic molecules
through the analysis of NMR relaxation data and I would like to
display the dynamics results superimposed onto molecular structures
within PyMOL.  I have attempted to open a PyMOL pipe using the '-p'
flag however, when relax finishes and closes the pipe, PyMOL
terminates printing the message:

  PyMOL: normal program termination.

Is there a simple way to keep the PyMOL binary running after a script
terminates?  I've searched through the sources but a solution isn't
immediately obvious.  I've tracked back from the file 'layer5/main.c'
where the 'printf()' statement is located back to the function
'CmdQuit' in the file 'layer4/Cmd.c', but can't find what is calling
the 'cmd.quit()' method.

Thanks,

Edward