In this lesson, we take a step back into the roots of IBM i development with a look at the classic Source Entry Utility (SEU). Using the video “SEU 101 – OLD SEU to Edit DDS File Source Code” as our guide, you’ll see how developers traditionally created and maintained DDS source members long before modern IDEs like RDi or VS Code existed. SEU may be old, but it remains fast, familiar, and still widely used in many IBM i shops for quick edits and legacy maintenance work.
This introduction will help you understand what SEU is, how it works, and why it continues to be part of the IBM i developer’s toolkit. Whether you’re learning it for the first time or brushing up on the basics, this lesson sets the stage for navigating DDS source code the “old‑school” way - directly on the green screen.