/SYSTEM (default)
       /NOSYSTEM

    Qualifies /INTO. Use with /INTO and one of the following
    qualifiers:

       /BRANCH
       /CALL
       /INSTRUCTION
       /LINE

    The /SYSTEM qualifier permits the debugger to set tracepoints
    within system routines (P1 space) as well as other routines. The
    /NOSYSTEM qualifier specifies that tracepoints not be set within
    system routines.