sorry if old. Just got a google alert about this one and though it might be of interest:
http://ds.advancedmn.com/article.php?artid=3395
http://ds.advancedmn.com/article.php?artid=3395
Recently published patent reveals a special secret about a new Nintendo DS model.
"A game apparatus includes a touch panel on which at least two pointing positions are simultaneously detectable."