RADIUS is just an authentication and accounting database, used to store information for easy retrieval by other devices on a network. It's main talent is to efficiently store information about network devices, and not necessarily to make it easy for you to see. While you can look directly at your RADIUS data through it's own interface(if you want to call it that, in some cases), that is not the preferred method of browsing the RADIUS server's database. A "front-end" is used for the database, as an easier-to-use interface that allows you to view the data in the database in a form that is easier digest. Which data that is stored is up to the administrator who sets up the network, but generally includes assigned data rate, current usage, current IP address, MAC address, protocol, username, password, routes, and many other things that can be found in the AAA section of the MT documentation. The "front-end" software takes this data and lays it out in a form that you can see more easily, and groups it with other data that may not be in the RADIUS server's database, such as customer billing and address information....
http://www.digitalpoint.com/products/isp/
Hitek