Important Notice

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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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:      RT020
 
  Text:         Device or resource busy
 
  Severity:     Recoverable
 
  Explanation:  You have attempted to open a file that is assigned to
                a device or resource (for example, a line printer)
                that is not available at this time.
 
  Resolution:   You can trap the error status returned by open and
                retry the open at regular intervals until it succeeds.
                                    -♦-