VMS Help FORTRAN, /DIRECTIVES, DEPENDENCE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Specifies whether Compaq Fortran 77 uses the CDEC$ INIT_DEP_FWD and CDEC$
  NOVECTOR directives.

  The CDEC$ INIT_DEP_FWD directive specifies that all data
  dependences in the succeeding loop are uniform and do not have a
  backward direction.  The CDEC$ NOVECTOR directive directs the
  compiler to avoid vectorizing an indicated DO loop.