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

       /DYNAMIC (default)
       /NODYNAMIC

    Controls whether dynamic process setting is enabled or disabled.
    When dynamic process setting is enabled (/DYNAMIC), whenever the
    debugger suspends execution and displays its prompt, the process
    in which execution is suspended automatically becomes the visible
    process. When dynamic process setting is disabled (/NODYNAMIC),
    the visible process remains unchanged until you specify another
    process with the SET PROCESS/VISIBLE command.