The Tapestry tutorial includes an additional application, the Workbench, which is used to show off interesting Tapestry components and features.
The Workbench is divided into several areas, as shown by the tabs across the top of the page. Over time, the Workbench and this tutorial document will expand together, and the number of tabs will increase.
In addition to the Inspector, the Workbench has a useful feature which can be activated using the checkbox at the bottom. When enabled, the complete (and verbose) information available about the request, session and context (normally displayed by the Inspector's engine view) is shown at the bottom of each page.
This feature can be very useful if you are interested in exactly how Tapestry forms and links work.