In the first iterations of Genero back in the early 2000’s, the Genero development team encountered a problem. When displaying in a GUI environment, it is expected that everything is in a window. However in Informix-4gl it was legal syntax for MENU to be the first UI statement and so the problem was… “Where is this MENU going to be rendered if it occurs before an OPEN WINDOW ?
The solution was to automatically open a window first. This is known as the default screen window.
There are then two main strategies to deal with the screen window. Read more at
https://4js.com/ask-reuben/ig-102/
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