I would second the tomcat's suggestion. But here I would create a webpage and based on the operator sites, I would first list the session information corresponding to the site and user. Then through the web front end would gather the inforamation from the operator and then invoke the database package to delete the session using alter system and then also log the information on the session to a log table with the time of delete and the person who deleted it. This way it would keep track of things and also would help you to answer some questions if one were to be raise to you.