process_record_user() Reading the documentation is a good start, but one needs to experiment. Search the code base. The project also contains hundreds of calls

process_record_user() Reading the documentation is a good start, but one needs to experiment. Search the code base. The project also contains hundreds of calls to this routine; one can see what others did. In my youth I coauthored a computer algebra system, but my contributions were all core code, inner loops, not close to the user interface. Yet many people managed to hack our system successfully. I had no meaningful advantage over them when I needed to do this myself, but their example spurred me to learn. Same with flunking my quals, first semester of my PhD program. The older students would tear through the questions in five minutes, at tea after each miserable day of testing. With this experience in mind, I doubled my scores the next semester. One really has to just dive into the code, and others do this.