My first experience with spreadsheets was some software running on an IBM mainframe that rented for 12,000 per month back in the early 1970s. iPlan interactive - or some such name. Years later it was visicalc then multiplan running on Xenix & that *was* a terrific program. The damned thing could be invoked for multiple concurrent sessions. It could pass parameters between sessions etc: etc:. But Bill killed it when he realised that he couldn't get as much moola from Xenix as he was getting from DOS.
Maybe on DOS multiplan was not as nice.
Cheers Doug