Library /sys$common/syshlp/SYSMANHELP.HLB  —  RESERVED_MEMORY, MODIFY  Qualifiers  /ZERO
       /ZERO
       /NOZERO (default)

    /ZERO implies /ALLOCATE. If you specify /ZERO, preallocated
    pages are zeroed during system initialization. Zeroed pages
    are required for memory-resident global sections; however, the
    pages do not need to be zeroed during system initialization. The
    default value is taken from existing Reserved Memory Registry
    entry.

    /NOALLOCATE implies /NOZERO because /ZERO is incompatible with
    /NOALLOCATE. If you do not specify /ZERO, or if you specify
    /NOZERO, preallocated pages are not zeroed during system
    initialization. Instead, these pages are zeroed when the global
    section is created.
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