GUI events (such as click on push button or alter field contents) are executed through individual blocks of logic called event handlers.
You can attach an event handler to a window or field (control).
User-defined events can supplement or replace standard events that are supported by the CA Gen window manager or by the window environment. This allows the user to have more control over the execution of GUI application procedures.
Note: There are other event types of interest to developers, especially events that are relevant to the business, such as year end arrives. However, in this discussion, the term event means GUI event.
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