Dear monk is important to me, may know HOw can i code the session id of each page, does cgi have the function like IIS which will automatically generate the session id. i'm new into web programming it make me hard. i have use the 'expirer', but it still loading the page when click back,i need a session id izzit correct way and ake a checking with the session id. then when click logout in the server side delete the expirer the id and the user may no longer login. but how i can do that to make the session if. and how can i do the pass in to check it. thank forthe help. anyway any web site teaching all this thing anyone can recommended.