Let's peek at the arcane ways of MS-DOS memory management.
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Just a moment...
https://raduzaharia.medium.com/ms-dos-applications-memmaker-626c1ca956dd
https://raduzaharia.medium.com/ms-dos-applications-memmaker-626c1ca956dd
I think anyone who dealt with "extended" vs. "expanded" memory back in the 90's is already eligible for sainthood.