Integrating with an existing website

[tiplib.com]

Hi there,

I'm looking for forum software to integrate with couple of my current sites which are running on apache, php and postgresql. These sites have their own user authentication. By integration I mean:

* sharing user account information so that when user has registered on the site an account will also be created in the forum and vice versa
* when user logs into site they should also be logged in to the forum and vice versa
* when user logs out from forum they should also be logged out from the site

Is that possible to achieve such integration and how easy would that be? Has anyone integrated vbulletin with a site running on other rdbms?

Thank you

[Reeve of shinra]

Are you sites running custom or off the shelf software?
What is your experience in PHP coding?

[UltimateOreo!]

Well, I would think so, its all database info. if you know how to add and pull database info, Its a yes.