phpbb user share

[angler]

1. If phpBB users can access the classifieds with same login, does that mean whenever a phpbb user registers, it creates them a classifieds account also? If not, anyone know how this is done?

2. Related to question 1, Will they still have to login to the classifieds even though they are logged into phpbb or is the session seamless?

3. If a classifieds user registers, can it be disabled so that it does not create a phpbb user?

Basically I want my phpbb users to be able to access the classifieds seamlessly. Also I want it so that whenever someone registers on phpbb, it creates a classifieds user also. I just need 1 way direction(phpbb -> classifieds not the other way.)