/sys$common/syshlp/helplib.hlb FORTRAN, Statements, INQUIRE, ACCESS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  ACCESS = acc

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

  'SEQUENTIAL'  If the file is open for sequential access
  'DIRECT'      If the file is open for direct access
  'KEYED'       If the file is open for keyed access
  'UNKNOWN'     If the file is not open