Using bcAuthenticate IIS Authentication Filter involves going through the following steps to configure the system:

1. NT Authentication: Setup Windows NT Accounts which your web users will be mapped to.
2. Mapping Users: Create a database (or use existing one) to map authenticated users to the proper NT Accounts.
3. NT Permissions: Setup directory access permissions to these NT user accounts on your NTFS file system to protect resources.
4. Windows 2003 Specific Permission settings.
5. Configuring DSN: Setup bcAuthenticate filter to access your user database through ODBC data source names.

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