If I remember correctly then Genera[1] also had such an interface. [1] https://en.wikipedia.org/wiki/Genera_(operating_system)#User_interface https://en.wikipe

If I remember correctly then Genera[1] also had such an interface. [1] https://en.wikipedia.org/wiki/Genera_(operating_system)#User_interface https://en.wikipedia.org/wiki/Genera_(operating_system)#User...