cDEC$ TITLE string
  cDEC$ SUBTITLE string

  The TITLE directive lets you specify a string and place it in the
  title field of a listing header.  Similarly, SUBTITLE lets you
  place a specified string in the subtitle field of a listing header.

  The "string" is a character constant containing up to 31 printable
  characters.

  To enable TITLE and SUBTITLE directives, you must specify the /LIST
  compiler option.

  When TITLE or SUBTITLE appears on a page of a listing file, the
  specified string appears in the listing header of the following
  page.

  If two or more of either directive appear on a page, the last
  directive is the one in effect for the following page.

  If either directive does not specify a string, no change occurs in
  the listing file header.

  For compatibility, !MS$TITLE:  and !MS$SUBTITLE:  can be used in
  place of cDEC$ TITLE and cDEC$ SUBTITLE.