Library /sys$common/syshlp/lse$menu.hlb SET_BUFFER_LANGUAGE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Syntax:  SET BUFFER LANGUAGE language_name

  Associates a language with the current buffer.

  By default, LSE uses a file-type specification to determine the
  language to associate with a buffer.  To disassociate a buffer with
  any language, use this command with a blank language name.