Yeah, palm rejection is better than anything else because they simply don't register iPad touch events when the pen's pressure sensor is activated. The underly

Yeah, palm rejection is better than anything else because they simply don't register iPad touch events when the pen's pressure sensor is activated. The underlying tech is that the pen is an ultrasound transmitter and the attachment has stereo microphones. It's then just a matter of basic trigonometry to get the position much more accurately than the iPad can detect a finger.