I'm not sure I understand what you mean - but the RPU is never master in the session. It is invited to the sessions by one of the consoles when session starts.
I can see in the command line for the consoles that it usually logs in as admin when starting up, and then immediately logs in as the user it had before shutting down - automatically. So it might be the same for the rpu - but it seems to forget which user it had before being invited to session.