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Indeed both the "..." and "disabling over removing" were in the windows 95 UI manual

They were original in the 1984 Macintosh OS (before it had a name), and published in the first edition (1987) of the Apple Human Interface Guidelines.

Just two of the things Microsoft copied successfully. :)

Eh, they were definitely from Xerox (so it would be unclear since that both Windows and the Mac System Software derived some of their UI elements from Xerox experiments)

The Alto? I don't think that's accurate. Only 2000 devices ever shipped, and I used one at my parent's workplace back in the day. But I would have been far too young to remember that detail.

It may well have been kicking around PARC before Jobs made the deal with Xerox. But I can't find any images that show either of those UI elements, pre-Lisa.

Also macOS in its various guises, for decades.

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