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A comment on The Origin of X-to-Close in UI Design.
See pg. 39 of this .pdf file http://bitsavers.trailing-edge.com/pdf/microPro/Wordstar_3.3...
"X" is used as the "exit wordstar" command menu option.
This was WordStar 3.3, in 1983. WordStar existed for far earlier than 1983, and likely always used "X" as the "exit wordstar" command.
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See pg. 39 of this .pdf file http://bitsavers.trailing-edge.com/pdf/microPro/Wordstar_3.3...
"X" is used as the "exit wordstar" command menu option.
This was WordStar 3.3, in 1983. WordStar existed for far earlier than 1983, and likely always used "X" as the "exit wordstar" command.