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- GEM was used more broadly than just on the ST. It started life as the GUI for CP/M operating system for use in IBM compatible. It was also implemented as an interface over DOS.
- GEM was licenced to Atari to serve as the GUI for their TOS operating system in 1985. Interestingly, this was after a Microsoft offer was rejected because of estimates it would take more than a year to develop
- Xerox connection... sued Digital for breach of patents?
- Wikipedia link