An example of how [protect] makes use of [authenticate] by inspecting the file "MultiGroupChecker" in the WebCatalogEngine folder, or in the Sandbox folder or the WebDNA folder is using fcgi version.

Basically, this is how it works:
The "MultiGroupChecker" checks

1. if the [username] is in the Users.db
2. if the [username] and [password] match in the Users.db
3. if the [username] is allowed access to the specified group in the [protect groups] tag
4. if the [username] has expired

If the user fails step 1, the authentication box will display. If the user fails step 2, the authentication box will display. If the user passes step 1 - 4 then the user will be allowed to access the page without the authentication box displaying.