Session Data single login ?

I own a website with an image rating section, a phpbb forum, and a story archive section. Members need to register, but currently they have to register individually to each section. I'd like a piece of code that will allow a single registration to be applied to all sections of my site. I'd like to have a login feature on the frontpage of my site. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform (?) Site is running on a Unix server. I want people surfing using ie to be able to use it (?!)