Library /sys$common/syshlp/dbg$help.hlb DEBUG, Built in Symbols, %TASK  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    (Applies only to tasking programs.)

    %TASK n (where n is a positive decimal integer) is the debugger
    syntax for referring to a task by its task ID. The task ID is
    a unique number associated with a task at the time the task
    is created. The task number n can be obtained using the SHOW
    TASK/ALL command or by examining task objects.

    Example:

    DBG> EXAMINE T1
    T1: %TASK 2
    DBG> SET TASK %TASK 2