SET(TAB_STOPS)
  Sets or changes tab stops in a buffer.
  Syntax
     SET (TAB_STOPS, buffer, {string | integer})
  Parameters
     buffer     The buffer for which you want to set tab stops.
     string     A string of numbers specifying the tab stops.  The minimum
                value of a tab stop is 1; the maximum is 65535; the maximum
                number of stops is 100.  The tab stops must be in ascending
                order.  Separate the values by a space.
     integer    An interval between tabs, rather than the actual tab stop
                positions.  The minimum value 1; the maximum is 65535.
  Examples
  1.  SET (TAB_STOPS, main_buffer, "4 8 12 16");
      Sets tab stops for the main buffer at columns 4, 8, 12, and 16.
  2.  SET (TAB_STOPS, main_buffer, 4);
      Sets tab stops for the main buffer at intervals of 4 columns.