System APIs can appear daunting at first, but when you dig a bit deeper you realize that there are really just a few API concepts that once learned allow you to easily access hundreds of APIs. This session will go through the pros and cons, dos and dont's of Retrieve, List, Open List, and Unix-type APIs. Examples used in the session will be based on RPG with the session handout providing the same examples in CL, COBOL, and C. By the end of this session, attendees will be able to use the vast majority of i5/ OS APIs.