For modern releases (for instance as of NetWeaver 750, software layer SAP_UI) the user interface is rendered according to the HTML5 web standard.
Since Netweaver 754 (software layer SAP_UI, ABAP Platform 1909) a touch enabled[1] user interface is available.
The Web Dynpro Framework is a server-side runtime environment into which many dedicated "hook methods" are available.
The developer then places their own custom coding within these hook methods in order to implement the desired business functionality.
), and those methods that are concerned with processing the fixed sequence of events that take place during a client-initiated round trip to the server.