Are you talking about Registration module? If so, probably there is some misunderstanding exists. Please check following information about Registration module:
You can set up voluntary user registration on your web site. This function has nothing to do with restricted access. Logged in users do not have to enter their name, address, and other data each time they fill a form on the site - this data is automatically inserted into the appropriate text fields of the form (for example, when posting to blog or buying in e-shop).
Note: To prevent automated registration, users will be required to enter a confirmation code to be able to register on your site. For more information it is better to check appropriate documentation part:
http://download1.parallels.com/Site...ebuilder-4.5-win-users-guide/registration.htm