Right. When touched in two places at once, the touch screen registers the press between two pressure points - in the middle.I've just lost one. Since there are like 1 or 2 games that need 2 stylus, it's not a problem for me.
Going a little off topic but in Hotel Dusk, there's a place that you have to use 2 stylus' (the game tells you tu use your both hands). Since I only had one, I used my finger as a stylus and past that part. While I was touching however, the icon was showing right between the two touching points. So I think DS can't recognize multiple touches, right ?