okay this is an odd question, so here it goes.

I have some forums set up, using the Invision Board software. (its all php and uses a Mysql DB). i have a few users on there, and i decided to make the main page of my site into a php-nuke portal. then i realized that i dont want users to have to register twice, so i am wondering if there is any way to make php-nuke read only the user data from the Invision tables in the DB. The nuke stuff and the forum stuff are in the same database, and i just want to modify my php-nuke so that when users sign in on the php-nuke page, it uses the forums info to log them in. is there any way to do this??