title: Integrating PunBB login system with the rest of my site
body: <p>First off, I am presuming this is possible please correct me if I am wrong.
  I have a simple login / registration system on my site now, however decided to delete this when installing PunBB discussion board. I prefer PunBB's login to my own so I was wondering whether it is possible to make login to the site only achievable through PunBB. Is their an extension for this? Or do you know of any useful sources that will help me implement this? Thank you in advance. </p>