A clipping dividerRobert Fletcher Sproull
A clipping divider
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…the point of the article was to publish the entire discussion thread so it was easy to read in one place, including some previously unpublished private email discussion, and a citation to the classic "A Clipping Divider" paper, as well as David Rosenthal's correction and comments to some mistakes in Alan Kay's Quora answer, and Alan Kay's correction and comments to some mistakes in Warren Teitelman's article "Ten Years…
on “Alan Kay on “Should web browsers have stuck to being document viewers?” and ...” ↗…has posted a response saying: > Kay's 1969 thesis has no overlapping windows; its "windows" are Sutherland–Sproull clipping viewports into a vector-display virtual screen ("the terminology follows [A Clipping Divider, 1968]", p. 40); nothing occludes or moves. Overlapping bitmap windows first appear in Smalltalk-72 on the Alto (1973–74), implemented by Ingalls. Tiling did neither come from Mesa nor from Kay; multiple…
on “The Early History of Smalltalk (1993)” ↗