wn_close -- close window

        USAGE

          wn_close(wn)
          WINDOWPTR wn;

                wn - handle of a previously opened window.

          wn_close removes the window specified by wn and restores the
          screen area under the window to its previous contents.  The
          memory allocated by wn_open is returned to the free list.  The
          cursor is positioned to where it was located prior to the
          wn_open call.

        RETURNS

          TRUE or NULL if error

        CAUTIONS

          None.