This is the place for RPG developers and IBM developers to mingle
and discuss our favorite language. We'll talk about the language
itself, its history, and its future. We will discuss the tools that
support it and the directions they are taking.
Here's an article by Scott Hanson of IBM, about how to debug problems with heap storage (storage that you allocate using %alloc or %realloc). https://www.ibm.com/developerworks/ibmi/library/i-mysterious_application/