"A retrospective on the Dorado, a high performance personal computer" from 1983 (PDF).

This is the followup on the Alto. The machine ran Smalltalk-80, Cedar and Interlisp-D environments.

The demo that the people from Apple saw was probably Smalltalk on this machine.

bitsavers.org/pdf/xerox/parc/t

Rob Pike was a little frustrated when he visted PARC and worked on those machines:

commandcenter.blogspot.com/201

When he speaks about "our windows" it's probably the Blit windowing terminal that later was commercialized as the Teletype 5620 and followers:

en.wikipedia.org/wiki/Blit_%28

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