/sys$common/syshlp/helplib.hlb FORTRAN, Error Messages, Compilation Errors, INQUNIT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  SEVERITY:  F

  MESSAGE TEXT:  Missing or invalid use of UNIT or FILE specifier in
  INQUIRE statement

  EXPLANATION:  An INQUIRE statement must have a UNIT specifier or a
  FILE specifier, but not both.