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And it all started with Visicalc. The spreadsheet and the word processor are the most important computer programs ever created. No wonder Google and Microsoft still make billions from these two.

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Yep they were the original "killer apps" and still are. They are the reason that PCs gained traction in businesses in the 1980s. I helped my chemistry teacher in High School back then to use Visicalc on a TRS-80 as a gradebook. Almost anyone who has used a computer for work has used a spreadsheet for something, whether managing simple lists, or something much more complicated.

I would argue that the compiler is the most important computer program.

Or maybe that it doesn't make that much sense to look for a most important program.

s/programs/applications/

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