/sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  ACTIVATE  TRACE  Description
    User-defined tracepoints are activated when you set them with
    the SET TRACE command. Predefined tracepoints are activated by
    default. Use the ACTIVATE TRACE command to activate one or more
    tracepoints that you deactivated with DEACTIVATE TRACE.

    Activating and deactivating tracepoints enables you to run and
    rerun your program with or without tracepoints without having to
    cancel and then reset them. By default, the RERUN command saves
    the current state of all tracepoints (activated or deactivated).

    You can activate and deactivate user-defined tracepoints or
    predefined tracepoints or both. To check if a tracepoint is
    activated, use the SHOW TRACE command.

    Related commands:

       CANCEL ALL
       RERUN
       (SET,SHOW) EVENT_FACILITY
       (SET,SHOW,CANCEL,DEACTIVATE) TRACE
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