All the necessary files are available in the CSUGLAB
For a very high-level overview you should consult the README.txt. More detailed (but slightly aged) programming info is available in the ProgrammingGuide.txt, and in the MMII.int and Brush.int Iota+ interface files.
MMII is in conceptually similar to the AWT EventListeners from Java 1.1. Our event model is much more limited, but the idea is similar.