/sys$common/syshlp/HELPLIB.HLB  —  INITIALIZE  Qualifiers  /INDEX
       /INDEX=position

    Specifies the location of the index file for the volume's
    directory structure. Possible positions are as follows:

    BEGINNING  Beginning of the volume
    MIDDLE     Middle of the volume (default)
    END        End of the volume
    BLOCK:n    Beginning of the logical block specified by n
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