Many classrooms now contain Internet connected computers with projection displays.
PP enables an instructor to rapidly and easily hand simulate many protocols, thereby concretely illustrating their operation. PP clearly displays the messages exchanged between client and server. The instructor generates client messages by clicking on buttons and filling in fields. Several years of classroom experience have demonstrated that PP helps students understand Internet application protocols. Many classrooms in affluent schools contain a network-connected podium computer with a projection display that the students can see.