Can ten year-old development modules still be useful? There's nothing about AI in this session.

When external authentication is not an option, but a solution demands a multi-file architecture, here is a solution for centralized account management. 

1. First, the reasonable scenario for a multi-file architecture and why external authentication is not an option (hint: mobile).
2. Second, the ten year-old module for centralized account management and implementation walk-through.
3. Finally, brainstorming thumbs in the dike for remaining issues.