This policy setting allows the administrator to exclude the specifiedcredential providers from use during authentication. Note: credential providers are used to process and validate usercredentials during logon or when authentication is required. Windows Vista provides two default credential providers:Password and Smart Card. An administrator can install additionalcredential providers for different sets of credentials(for example to support biometric authentication). If you enable this policy an administrator can specify the CLSIDsof the credential providers to exclude from the set of installedcredential providers available for authentication purposes. If you disable or do not configure this policy all installed and otherwise enabled credential providers are available for authentication purposes.