A Dynpro consists of a cover and its race logic and manages specifically 1 dialog moves.
The various elements of the Dynpro are:
Flow Logic: signals of the ABAP/4 modules for a screen.
Screen layout: States of the text, areas, pushbuttons and so moving to a screen.
Screen feature: number of the screen, number of the succeeding screen and others.
Fields aspects: Definition of the properties of the unique fields on a screen.