The document provides examples of using various Qt GUI classes in Ring including QComboBox, QMenuBar, QContextMenu, QToolBar, QStatusBar, QDockWidget, QTabWidget, and QTableWidget. Code snippets are given to demonstrate how to create instances of these classes and customize their behavior and appearance in a Ring application. The examples focus on common tasks like adding menu options, toolbars, dockable widgets, tabs, and tables to graphical user interfaces.