The document discusses using the Application Layout control in IBM Notes and Domino to rapidly develop a consistent user interface. It describes prerequisites like installing the Extension Library, configuring OneUI themes, and using tree nodes and navigators. The key aspects covered are designing an Application Layout within a custom control by enabling all six facet areas and adding properties, handling navigation and context, and strategies like using Bootstrap themes. The document aims to demonstrate how the Application Layout control can help implement a "One UI" design framework for an application.