title: Django: Managing Session Variables to manage the browser back button
body: <p>I am creating a web based Mock test paper, which needs to be fairly secure.</p>
  
  <p>The needs are 
  Each question can be attempted and answered  just once.
  All are multiple Choice questions
  Once a question is answered and the submit pressed, then that session must expire, and the same question must not appear either through back button or some other way.</p>
  
  <p>In case the browser crashes or the system crashes, the student must be able to go back to the last question which was being attempted, and not yet answered and submitted.</p>
  
  <p>What would be the best strategies to adopt while implementing it in Django. How do you automatically kill the session, once the submit button is pressed? And how do you ensure that by pressing the back button, you are not able to access a question attempted and answered?</p>
  
  <p>I tried googling, but I am not able to point to resources that would guide me better. I have seen django sessions documents, but I am not sure whether I know the right way to do this. Any suggestions can help</p>