Let's talk about SUBFILE programming in RPG
If you have grown up through the world of AS400 a few decades ago, or through the wonderful ISERIES machines of the early 2000's then you *maybe* are using the current IBM i POWER SYSTEMS that replaced those old boxes.
If that's the case, in most places you are using subfiles to display information on those smelly old green screen terminals.
Writing a SUBFILE PROGRAM means knowing how to code them, ranging from simple full load, to expanding, to page at a time.
Each type of Subfile has different programming styles... so let's dive in and have a play with SUBFILES in RPG Programming.