I’d be interested in any docos too. So far I’ve had to discover them myself manually by trawling through the System Info panel, or by other people telling me little bits and pieces as I go along.
To understand how everything works underneath, debug console is the best tool to start with.Open the debug console aside and then do some transaction in IFS. You can see which server calls made with parameters in the console. By this way it’s easy to understand the IFS call sequence.