Thanks for the reply Eric!
But my question remained unanswered.
"I need to build a new registration system using my WebAssist software - and I'd like the same registration system to work with my PowerStore 3. ....Should I set up the master user registration using theUser Registration Solution Pack? Will it work with an existing database and SA1 encryption? Or should I just create a new one using Security Assist? OR - is it possible to adapt the PowerStore3 registration system to work with the existing database and use this for the entire site? And will this all work if these directories are in sub directories of my website."
**see my first question for more details.