From a Developer's Point of View
SeedCode Complete is designed to be modified, so all the documentation here is for developers. But this table of contents is designed to give developers an overview of how Complete works and where the touch-points, hooks, and APIs are so they can start really making serious changes.
Developer's Table of Contents
The File Model: Separation
The Data Model: the relationship graph in SeedCodeComplete.fmp12 is the best statement of this, but the following articles can help flesh this out.
Advanced Helper scripts & CFs
Zulu: linking FileMaker to iCal and Google Calendar