Hello,
Today we move forward to lesson 6: Create a module in backend.
In this lesson, we would learn how to: Configure the adminhtml router, Add menus from file adminhtml.xml and Configure ACL for menus and Add controllers for each menu.

The Front Controller has an array of “routers” that it uses to decide which module the URL should trigger so Front Controller plays a very crucial role in Magento. And do you know how to locate Front Controller class, or events that Front Controller fires and Front Controller’s responsibilities? If you are interested in these issues, please follow my article.