How does bancho works?

I'm pretty much curious how does bancho works. I know, it's a stupid question, and most of you already know how bancho works, but i don't.

Bump? Like does it ban you when replay is posted, or when you're playing?

*I Think.

Banco will Detect and Force Restricted when you use All Multiple Mods. E.G(HR, HD, FL, DT).
Also, Banco will Calculate with your Approx Legit Scores PP, when You get More than 500pp Banco will Reading your History Scores.

Maybe.

computerized bot that handles the basic.