To add a private database uuu$DATA:
----------------------------------
  o Edit COM$MGR:MDSPLUS_PRIVATE_DATABASES.COM

Background:
----------
  o MDSplus data are served to unix via MDS$TOP:MDSIP.COM, which
    executes MDS$ROOT:[SYSMGR]MDSIP.COM, which runs MDSIP.EXE.

  o MDSIP.EXE changes the "persona" of the server process via
    sys$persona_create and sys$persona_assume system services.
    Therefore, we were unable to create any default uuu$DATA logical
    name, because we don't adopt our USERNAME until we're already
    inside MDSIP.EXE

  o However, if necessary uuu$DATA definitions are available (e.g.,
    in the system lnm table), then the server can see them.

  o The MDSPLUS_PRIVATE_DATABASES procedure gets executed at system
    startup from within COM$MGR:comsyslnm.com.  Defines all known
    "uuu$DATA" logical names.