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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Message:      RT012
 
  Text:         Attempt to open a file which is already open
 
  Severity:     Recoverable
 
  Explanation:  You have tried to open a file which is already open
                and so cannot be opened again.
 
  Resolution:   Cancel your second attempt to open the file.  If the
                fact that the file is already open is acceptable to
                you, continue to run your program.
                                    -♦-