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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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 F6421
 
     file read-only or locked against writing
 
     The program tried to transfer data to a file that was opened in
     read-only mode or locked against writing.
                                    -♦-