Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  SET  THREAD  Parameters
 task-spec

    Specifies a task value. Use any of the following forms:

    o  When the event facility is THREADS:

       -  A task (thread) ID number as declared in the program, or a
          language expression that yields a task ID number.

       -  A task ID number (for example, 2), as indicated in a SHOW
          TASK display.

    o  When the event facility is ADA:

       -  A task (thread) name as declared in the program, or a
          language expression that yields a task value. You can use a
          path name.

       -  A task ID (for example, %TASK 2), as indicated in a SHOW
          TASK display.

    o  One of the following task built-in symbols:

       %ACTIVE_TASK    The task that runs when a GO, STEP, CALL, or
                       EXIT command executes.
       %CALLER_TASK    (Applies only to Ada programs.) When an accept
                       statement executes, the task that called the
                       entry associated with the accept statement.
       %NEXT_TASK      The task after the visible task in the
                       debugger's task list. The ordering of tasks
                       is arbitrary but consistent within a single
                       run of a program.
       %PREVIOUS_      The task previous to the visible task in the
       TASK            debugger's task list.
       %VISIBLE_TASK   The task whose call stack and register set are
                       the current context for looking up symbols,
                       register values, routine calls, breakpoints,
                       and so on.

    Do not use the asterisk (*)  wildcard character. Instead, use the
    /ALL qualifier. Do not specify a task with /ALL or /TIME_SLICE.
    If you do not specify a task or /ALL with /ABORT, /[NO]HOLD,
    /PRIORITY, or /RESTORE, the visible task is selected.
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