Your page can have an exclusive area for those users registered. To gain access to this area, user will need to input an user and password. The user will need to be validated only once each visit to access the exclusive content. Drupal is configured in such a way that access to the restricted areas is impossible unless the users were previously validated.
User credentials are unique per user and automatically generated by the system. This will allow to create access statistics per user.
The access is protected by Quodem standard measures. The passwords will be store encrypted in the database, so no one can access them except the user. If a user forget his/her password a new one need to be generated.
Some samples of the services that can be offered to the registered user can be: Forum, eLearning, member's directory, virtual communities, distribution list, events registration, customized application, etc...