How does the Dialog handle user requests ? | ABAP Module Programming

- When an action is performed, the system triggers the PROCESS AFTER INPUT event. The data passed includes field screen data entered by the user and a function code. A function code is a technical name that has been allocated in the Screen Painter or Menu Painter to a menu entry, a pushbutton, the ENTER key or a function key of a screen. An internal work field (ok-code) in the PAI module evaluates the function code, and the appropriate action is taken.