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

       /INSTRUCTION
       /INSTRUCTION[=(opcode[, . . . ])] (VAX only)

    When you do not specify an opcode, causes the debugger to trace
    every instruction encountered during program execution.

    (VAX only) If you specify one or more opcodes, causes the
    debugger to trace every instruction whose opcode is in the list.

    If you specify a vector instruction, do not include an
    instruction qualifier (/UNALIGNED_DATA, /VECTOR_INSTRUCTION,
    /MODIFY, /0, or /1) with the instruction mnemonic.

    See also the /INTO and /OVER qualifiers.