Library /sys$common/syshlp/helplib.hlb  —  FORTRAN  Statements  INQUIRE  DIRECT
  DIRECT = dir

  dir  Is a character scalar memory reference that is
       assigned one of the following values:

  'YES'       If the file is open for direct access
  'NO'        If the file is not open for direct access
  'UNKNOWN'   If the file is not open
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