I am wondering how do I logout a user completely and make sure the pages/data aren't visible?

 

when user logouts out, i issue auth.logout()

i am using ssl/https.

 

 

i try it now, i logout.. but, when i hit the back button, i see the prior page.

 

though, clicking anything will require me to login of course.

 

i want to "expire" the pages after the user logs out.