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Having worked at IBM, I would guess that using the tab key in this way was part of a patent they were pursuing and Microsoft's use would show this to be 'obvious' and thus not patentable. But that is just a guess. In the 80's IBM had a whole class of high level technical people called "Systems Engineers" whose entire job description was to opine on the merits of any given system. Not write systems, not debug them, and certainly not to explain them, it was simply to opine "you're doing it wrong." |