Writing on a student's paper can be a fast and more personalized way to communicate with a student about their mastery of the subject. The digitization of our learning environments has limited the opportunities for this old practice. It turns out, however, that advancing hardware has dovetailed well with the work we've done over the years to provide an in-line grading tool that allows for speedy evaluation of student work.
Recently, a customer asked us if it were possible to markup a student assignment using a pen or stylus with a tablet computer. Having recently acquired a MS Surface Pro 4, I volunteered to demonstrate this. The video does have an annoying whine at times and for that I apologize. I'm sure there is a clever way to remove it, but it will have to wait for another day.