219Chapter 16 .Window and Frame Objects For a single, frameless document, the object model starts with just one window object, which contains one document, as shown in Figure 16-1. In this simple structure, the window object is the starting point for all references to any loaded object. Because the window is always there it must be there for a document to load into a reference to any object in the document can omit a reference to the current window. In a simple two-framed frameset model (Figure 16-2), the browser treats the container of the initial, framesetting document as the parent window. The only visible evidence that the document exists is that the framesetting document s title appears in the browser window title bar.