VMS Help FORTRAN, Statements, Directive Statements, IDENT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  CDEC$ IDENT string

  The IDENT directive lets you specify a string that can be used to
  identify an object module.  The compiler places the string in the
  identification field of an object module when it generates the
  module for each source program unit.  The string that you specify
  can consist of a group of up to 31 printable characters delimited
  by apostrophes.

  Only the first IDENT directive is effective -- the compiler ignores
  any additional IDENT directives in a program unit.