PADDs were used by such space-faring organizations as Starfleet, the Andorian Imperial Guard, Bajoran Militia, Cardassian Union, Klingon Empire, Romulan Star Empire, and Vulcan High Command. They were common to cultures even as distant as the Delta Quadrant. PADDs were also used by many aliens of different species to bid on slaves at an Orion slave market on Verex III. (ENT: "Borderland")