disconnect user and clear session

Dear ALL I have usering freeradius version 1.1.4 with mysql it is working fine but i dont know how to kick off user during login time means i want to disconnect user from radius then how to do it and i also have one more problem of session i have disconnected user but whn i use radwho command i give me u r login why ??? how do i clear old session in radwho caz whn i try to reconnect it give me error your are already connected - access denied??? Satish Pate system administrator --------------------------------- Here’s a new way to find what you're looking for - Yahoo! Answers