MPE_Log_get_event_number -  Gets an unused event number
       int MPE_Log_get_event_number( )
       A    value    that   can   be   provided   to   MPE_Describe_event   or
       MPE_Describe_state which will define an event or state not used before.
       This  routine  is  provided  to  allow packages to ensure that they are
       using unique event numbers.  It  relies  on  all  packages  using  this
       routine.
       mpe_log.c
                                   11/5/2003       MPE_Log_get_event_number(4)