PuP showed that internetworking ideas were feasible, influenced the design work on TCP/IP, and laid a foundation for the later XNS protocols. At one point, Vint Cerf and Bob Kahn organized meetings at Stanford, and Xerox Researchers Bob Metcalfe and John Shoch attended. However, the Xerox attendees were told by a Xerox lawyer that they could not talk about PuP. During design discussions, the Xerox attendees kept pointing out flaws in the ideas that were suggested, until one of the Stanford researchers blurted out, "You guys have already done this, haven’t you?"