Create the WHERE list to subset the dataset. Select all males who are taller then 5 feet.
   wlst = makelist();
   wlst = insertc( wlst, 'sex="M"', -1);
   wlst = insertc( wlst, 'and height > 60', -1);
   call send( datid, '_setWhere', wlst );
   wlst = dellist( wlst );