Library /sys$common/syshlp/basichelp.hlb Qualifiers, CROSS_REFERENCE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Tells BASIC  to  include  cross-reference  information  in  the  program
  listing  file.   If  you  specify  KEYWORDS, BASIC also cross references
  BASIC keywords used in the program.

  Format

      [NO]CROSS_REFERENCE [ { : } [NO]KEYWORDS ]
                            { = }