Xerox PARC stole everything they could from PLATO after their 1972 tour of PLATO and being PhDs never gave credit where credit was due! Picture language, app generator, multilingual fonts, a system so simple even a kid could learn to program it (I did at age 14, self taught), bitmap graphics, etc. When I went to work at Xerox Office Systems Division - the development arm of PARC - I would say that after 13 years of trying - with computers 10x faster - they were PARTIALLY caught up! Highly inferior communications tools, and no support for inter-terminal games . .