Library /sys$common/syshlp/dbg$help.hlb DEBUG, SHOW, EVENT_FACILITY, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  DBG> SHOW EVENT_FACILITY
  event facility is THREADS
       . . .

      This command identifies the current event facility to be
      THREADS (POSIX Threads) and lists the associated event names
      that can be used with SET BREAK/EVENT or SET TRACE/EVENT
      commands.