For example, say the user is using a left hand finger to drag a slider, while holding the pencil in their right hand-- would it be possible to make the pencil vibrate to indicate the dragged slider knob reached a certain point? I haven't specifically tried in detail, but my expectation is that, yes, this is possible and should work. The concrete example here is to imagine a drawing canvas where the user is drawing with one, moving the canvas with the other, and haptics should occur when the pencil hits the edge. IMHO, I think it's reasonable for the two cases below to both vibrate in exactly the same way: The user moves the pencil until it hits the edge. The user holds the pencil stationary and move the canvas until the pencil hits the edge. The point of haptics in a scenario like this is to make the edge feel more physical and NOT allowing #2 actual subverts that goal. In addition, if you look at more complicated cases where both the pen and the