Find the real article at:
Here is an even more brief summary:
One thing to remember about SharePoint is that it is built on Asp.Net which is built on IIS.Realizing this you will realize that SharePoint 2007 "inherits" a lot authentication providers from Windows and IIS
Internet Information Server:
- SQL Server
- Active Directory
- as well as quite a bit of extensibility.
I found an example of using a sharepoint list as an authentication provider at:
HOWTO: Configuring a Office SharePoint Server 2007 Publishing Site with Dual Authentication Providers and Anonymous Access
Office SharePoint Server 2007 - Forms Based Authentication (FBA) Walk-through - Part 1
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