There are four types of forums, each with varying degree of access control:
Public, Protected, Restricted, and Private.
Public Forum: Public forum does not require prior
registration for the user to particiapate.
It is read and post for everyone.
Protected Forum: Protected forum is read-only
for non-registered members. The user must be registered and logged on to post.
Restricted Forum: Restricted forum is only accessible
by registered members in following user groups: admin, moderator, team, and member.
Private Forum: Private forum is only accessible by registered
members with access privilege manually granted by the administrator.