VMS Help  —  Sys Files, [SYS$LDR]  IO_ROUTINES_MON.EXE
    Debug version of I/O-related OpenVMS executable, in which debug
    code of various types has been enabled; not intended for use in
    production systems but only in development systems or as a possible
    troubleshooting aid on systems experiencing serious I/O-related
    OpenVMS software problems. The image is loaded into the system if
    the SYSTEM_CHECK SYSGEN parameter is set correctly.
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