/sys$common/syshlp/DBG$HELP.HLB
DEBUG, CANCEL, BREAK, Qualifiers, /EVENT
 *Conan The Librarian 

       /EVENT=event-name

    Cancels the effect of a previous SET BREAK/EVENT=event-name
    command. Specify the event name (and address expression, if
    any) exactly as specified with the SET BREAK/EVENT command. To
    identify the current event facility and the associated event
    names, use the SHOW EVENT_FACILITY command.
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