Thanks for the reply. > I was referring to Switcher, from 1985 Ah, OK. You didn't _say_ that, though. > which I believe ran on 128k Mac's. I don't think so,

Thanks for the reply. > I was referring to Switcher, from 1985 Ah, OK. You didn't _say_ that, though. > which I believe ran on 128k Mac's. I don't think so, no. The story of its development is here: https://www.folklore.org/Switcher.html https://www.folklore.org/Switcher.html It mentions needing the RAM, but not what system version. MultiFinder came in with System 5: https://www.folklore.org/Switcher.html https://www.folklore.org/Switcher.html ... so, before that. I would guess System 2, which was contemporaneous, but I don't know. https://en.wikipedia.org/wiki/Classic_Mac_OS#Release_history https://en.wikipedia.org/wiki/Classic_Mac_OS#Release_history > I was referring to Switcher because it set the user experience patterns and expectations for how app switching should work that led to multifinder and OSX per-app switching patterns. Huh. OK. I had never considered that before.