Subset on STATE values less than 20.
   list=makelist();
   list=setnitemn(list, 20, 'state');
   call send(tabid, '_setKey', rc,
            'state', 'LT', 'scroll', list);
   call send(tabid, '_keyCount', rc, count);
   put count=;
return;

TERM:
   list=dellist(list);
return;