WebBrowser
Much of Gecko's functionality is exposed through the nsWebBrowser component. Embedding applications can leverage this component to easily access many of Gecko's features. Each WebBrowser instance represents the "client-area" of a typical browser window. The WebBrowser exposes a set of interfaces which allow the embedding application to control activity and respond to changes within this client area. Using these interfaces, and those on a related chrome object that the embedder must provide, an embedding application can build up its own user interface around a WebBrowser instance.
