Well. This is a good technique for those who can interpret the context sensitive menus that pop up when the right mouse button is clicked in Windows, but for the uninitiated it can be a very scary ugly detailed and powerful can of worms. I believe a much better tool for understand the inner workings of a GUI that is as complex as Windows (as much as I dislike the coding involved, the usability of that particular OS is very good) is the tool tip. A tool tip is a little backdropped box with some text that appears after the mouse pointer is held over an icon or whatever. These can help in many situations. The context menus can be helpful later, but at the beginning they can be confusing and the fact that they change depending on context doesn't help at all.