The 'disposition' is a value  that  indicates  what  VSI  Pascal
  should do with the file after you close the file.

  If SAVE is specified,  the  file  is  retained.   If  DELETE  is
  specified, the file is deleted.  If PRINT is specified, the file
  is printed on a line printer and is retained.   If  PRINT_DELETE
  is  specified,  the  file  is  deleted  after it is printed.  If
  SUBMIT is specified, the file is submitted to a queue or  placed
  in  a  background  process and is retained.  If SUBMIT_DELETE is
  specified, the file is deleted after being processed.

  SAVE is the default for external files.  DELETE is  the  default
  for internal files.