ABL makes all keyboard actions available as events that you can specify by either key label or key function. You can write triggers for these keyboard events, and associate these triggers with any field-level widget that receives input focus. For a complete list of key label and key function names, and information on how to use them, see the chapter on handling user input in OpenEdge Development: Programming Interfaces.
Keyboard events have default effects depending on the widget that receives the event. For example, the "A" key label event displays an uppercase "A" in a fill-in or editor widget, but has no default effect when applied to a button. ABL organizes some key function events into several classes that have default effects on selected groups of widgets. ABL also provides special keyboard events to write default triggers on classes of keys. You can use these default events to write a trigger for all keys in a particular class for which you have not defined a key label or key function event trigger.
