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

  NUMBER:  47

  ERROR CODE:  F

  MESSAGE TEXT:  write to READONLY file

  EXPLANATION:  A write operation was attempted to a file that was
  declared READONLY in the OPEN statement that is currently in
  effect.