Comment by markus_zhang

7 hours ago

I think they learned by reading books such as Undocumented Windows or Windows Internals (not to be confused with Windows NT internals), and Microsoft documents.

In fact, I’d argue it was more fun than programming Javascript these days.

It wasn't really the 'Undocumented' and 'Internals' books. Pretty much everything in the headlined article was to be found in the SDK, Microsoft Press publications, and in many third party books about DOS+Windows programming.

Petzold's Programming Windows book, for example, devoted an entire chapter (chapter 7) to memory management, with diagrams and examples. In the 2nd edition (which I just pulled off the shelf to check) that chapter runs to some 40 pages.