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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     FORTRAN run-time error F6409
 
     LOCKING illegal on sequential file
 
     A LOCKING statement specified a unit that was not opened with
     ACCESS='DIRECT'.
                                    -♦-