kind of works? reading multiple mice: any c programmers want to look at this?

[SpriggsySpriggs]

I would just Google some of the drawing functions for Windows. Google is good at finding MSDN pages.

That's what I did (I included those links a few posts up). What I found is really low level and without concrete examples. They talk about things beyond window handles, stuff that a Windows C++ programmer would understand. I started googling drawing graphics examples in c for windows, and found some, but need to go through it all. A few mention SDL2, OpenGL and other libraries, I'm just looking for the most basic library-less way to draw a rectangle, so I imagine that would be a Windows API function. I'll have to read through all that stuff and see if I find something.

Drawing Rectangles - Win32 apps | Microsoft Learn (searched "draw rectangle msdn win32")