Figuring out the terms used in the documentation

[Sleep]

Thank you very much, Adam. I have made a slightly messy diagram 
including some of what you and Alan have posted, I have yet to explore 
in depth the parts related to Events so I could not extend that part 
yet. I am sharing mostly in the hopes that it can be useful to instruct 
other beginners to make sense of X11 libraries, specifically Xlib and 
XCB: https://postimg.cc/rKNbzzmc