What is a key characteristic of Web Dynpro applications?

Web Dynpro applications are distinguished by their use of the model-view-controller (MVC) architecture. This design pattern separates the representation of information from the user's interaction with it. In the context of Web Dynpro, the model represents the data and business logic, the view is responsible for the presentation of the data, and the controller manages the flow of the application and user interactions. This separation allows for better organization of code, easier maintenance, and the potential for reuse of components.

The other options do not accurately reflect the functionalities and characteristics of Web Dynpro applications. For instance, Web Dynpro applications are not limited to desktop environments; they are designed to be adaptable to various devices, including mobile. Additionally, while the framework allows for customization, not every component requires custom coding, as it provides a range of standard reusable components. Finally, Web Dynpro applications are designed to support mobile responsiveness, enabling a seamless user experience across different devices.