One of the biggest improvements in Windows SharePoint Services 3.0 is the fact that it is built on top of ASP.NET 2.0. This enables SharePoint sites to use the membership provider model that abstracts the identity and authentication store away from application and makes it more pluggable. In addition, in Windows SharePoint Services 3.0, administrators can now create multiple entry paths into a SharePoint site collection, with each one having its own authentication configuration.
Learn how to configure a site collection with two entry points that use different authentication mechanisms in Windows SharePoint Services 3.0.
Warning: MSDN Archived
When Microsoft retired their MSDN site, it impacted their Visual How To series. Therefore, you may see rendering issues for these Visual HowTo’s including playback problems with the videos. Unfortunately this is out of my control.