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  Routine:      CBL_OPEN_FILE
 
  Function:     Opens an existing file for byte-stream operations.
 
  Syntax:       CALL "CBL_OPEN_FILE" USING      file-name
                                                access-mode
                                                deny-mode
                                                device
                                                file-handle
                                     RETURNING  status-code
 
  Parameters:   file-name              PIC X(n).
                access-mode            PIC X COMP-X.
                deny-mode              PIC X COMP-X.
                device                 PIC X COMP-X.
                file-handle            PIC X(4).
                status-code            See ◄Key►
                                    -♦-