I think this is a misinterpretation. See the footnote in this article:
http://www.os2museum.com/wp/why-does-windows-really-use-back...
Look at the positions of `\` and `/` on this keyboard: https://en.wikipedia.org/wiki/Model_F_keyboard#/media/File:I...
Both were easy-to-type characters on US-layout keyboards, not requiring shift or any other control key.
I think this is a misinterpretation. See the footnote in this article:
http://www.os2museum.com/wp/why-does-windows-really-use-back...
Look at the positions of `\` and `/` on this keyboard: https://en.wikipedia.org/wiki/Model_F_keyboard#/media/File:I...
Both were easy-to-type characters on US-layout keyboards, not requiring shift or any other control key.