Haven't seen this until just now, but I have a feeling I'll be referencing this a bunch going forward in my that annual "Windows 3.x is *not* just a GUI" online fights. A nicely laid out, easy to understand technical explanation of how Windows 3.x functions: https://www.xtof.info/inside-windows3.html
@dosnostalgic I always say "sure, it was just a layer on top of DOS. Aside from managing the graphics, disk, memory, network, and input devices... DOS handled everything else!" 😌