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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Verb:         OPEN
 
  Function:     Initiates the processing of files. It checks
                and/or writes labels and does other related tasks.
 
  Syntax:       Which format?  ◄Sequential►   Relative & indexed
 
              ┌───────────────────────────────────┐
              │           ┌───────────────────────┐
              ▼           ▼                       │
     ►►──OPEN─┬─INPUT──┬──file-name-1─┬───────────┬──►◄
              ├─OUTPUT─┤              └─WITH LOCK─┘
              ├─I-O────┤
              └─EXTEND─┘
                                    -♦-