I have a major question

I am new to all this stuff... I recently had a 2 logins on my site.. one was for alp software and one was punbb.. if I was to intergrate it does that mean I could use just the punbb login for my site and it would work for the alp software?????

So if I had 10 different logins for all sorts of stuff.. I could do a "intergration" method so that those scripts would work for the usernames and passwords for punbb???? if so thats amazing!!

Could someone point me in the right direction on how exactly to do this???