Yes, that is what I want to know. The Undocumented techniques or in your langage "the other ways of doing stuff". I also want to know how to have direct memory access. For example, we know that the keyboard status is stored at address 0x417. I want to write to that address directly but Windows just wont allow it because my program runs at ring 3(least privileged). I want to know how to transfer my program to ring 0.
I know these stuff is quiet advanced, but I want to have these inside knowledge.