Imagine you have to (re-)calibrate your cameras on the customer machine, but the customer machine has a HALCON runtime license only. Use HDevRunner to run your calibration code immediately on the customer computer without requiring a HALCON development license.
Present your algorithm in fullscreen to your fair trade visitors or to the human operators in the factory. Distracting GUI elements (task bar, scripts, ...) are no longer visible.
Run unit tests automatically whenever you save an image processing procedure. This way, you get immediate feedback whether your tweaks improved the overall performance of the vision algorithm or not.