From Xojo Documentation
New in 2010r4
A page of the application. This is the equivalent of a Window in a desktop application.
One important difference, of course, is that several pages may be displayed in the same browser window (though not at the same time, of course). But in other respects, a WebPage is very much like a desktop window. In both cases, the state of controls is managed automatically. You will only lose state when you call the Close method of a page or when the application quits. Page state is managed on a per session/per page basis. See the WebSession object. That means two sessions (two users) would each have their own state per page.
Hash Tags (aka anchors or URL fragments) are used to create bookmarks to specific pages or areas of your web apps. This is an example hash tag:
For more information on hash tags, refer to the WebSession class.