Websites on VOICE are interactive - they do not just present static information to visitors. All sites can have their own members who can contribute information to the site via discussion forums, surveys, petitions, and more.
There is comprehensive user management functionality in all websites.
Through the admin interface the site administrator can maintain a list of all the members of the site, specify exactly what they should have permission to do within the site, and use a simple interface to get in contact with them all via email. You can even allocate some members to be additional administrators to help you maintain the site.