By the end of the summer of 1986, Salas had created a slideshow-like demonstration of a system known as Modeler on the IBM PC.
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One worrying problem turned out to be an enormous advantage in practice; as the back-end was written in C++ and the front-end in Objective-C, it turned out to be very easy to segregate the program and track down bugs.
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Pito Salas, a developer at ATG, decided to attack this problem.
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His version, Lotus 1-2-3, would go on to be an even greater success than VisiCalc, in no small part due to the fact that it ran on, and was tuned for, the new IBM PC.
While working with the Lotus Advanced Technology Group in 1986, Pito Salas invented a next-generation spreadsheet concept which was released by Lotus in 1989 as Lotus Improv.
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