Disconnect user in radius

Dear ALL I have useing freeradius with microsoft mssql now my question is how do i disconnect user from freeradius means example:- user xyz is online and i want to disconnect user from radius so what is the option for this task ?? is there any script or any option to integrate with webpage of dialupadmin ??? Satish Patel --------------------------------- Here’s a new way to find what you're looking for - Yahoo! Answers