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

    The current event facility (ADA, THREADS, or SCAN) defines the
    eventpoints that you can set with the SET BREAK/EVENT and SET
    TRACE/EVENT commands.

    The SHOW EVENT_FACILITY command identifies the event names
    associated with the current event facility. These are the
    keywords that you can specify with the (SET,CANCEL) BREAK/EVENT
    and (SET,CANCEL) TRACE/EVENT commands.

    Related commands:

       (SET,CANCEL) BREAK/EVENT
       SET EVENT_FACILITY
       (SET,CANCEL) TRACE/EVENT
       SHOW BREAK
       SHOW TASK
       SHOW TRACE