HELPLIB.HLB  —  DIFFERENCES  Qualifiers  /WINDOW
       /WINDOW=size

    Searches the number of records specified by the size parameter,
    before a record is declared as unmatched. By default, the
    DIFFERENCES command searches to the ends of both input files
    before listing a record as unmatched.

    The window size is the minimum size of a differences section
    that will cause the DIFFERENCES command to lose synchronization
    between the two input files.
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