> Don't forget that, back then, systems were small enough to be understood easily on your own. Even in the 90s, Windows (e.g. 9x family or NT family) was too c

> Don't forget that, back then, systems were small enough to be understood easily on your own. Even in the 90s, Windows (e.g. 9x family or NT family) was too complicated to be easily understandable on your own. Nevertheless, the people (IMHO rightly) complained about undocumented, private APIs in Windows.