v_sapd -- scroll active display page down

        USAGE

          v_sapd(nl, rul, cul, rlr, clr, atrib);
          int nl, rul, cul, rlr, clr, atrib;

                nl  - number of lines to scroll
                rul - row of upper left hand corner of scroll area
                cul - column of upper left hand corner of scroll area
                rlr - row of lower right corner of scroll area
                clr - column of lower right corner of scroll area
                atrib - attribute to be used for blanking

          v_sapd is a general purpose routine that can be used outside of
          the window environment.

          A value of 0 for nl scrolls (blanks) the entire area.  To clear
          the entire video screen use v_sapd(0, 0, 0, 24, 79, NORMAL).

          Attributes are defined in windows.h.

        RETURNS

          Nothing.

        CAUTIONS

          None.