With multiple clients is it possible for ISPConfig to manage multiple installs of phpbb3 for example? What is the correct pattern for pulling this off? I imagine it will involve creating a new DB in ISPConfig and then managing the multiple phpbb3 installs manually on the server. I am very new to ISPConfig so not all its usage scenarios come naturally yet.
Create as many websites an as many databases in ispconfig that you need and then install phpbb3 into the websites. The number of phpbb installs is only limited by the capabilitys of you hardware and not ispconfig.