Once locked, users can no longer post to the thread. The Moderator can ban by IP using this option. IP can be any octet of the IP address, so you can ban entire subnets. The Moderator can ban by a full e-mail address or ban by domain. The Moderator can ban by user name.
Moderators can empty that trash bin.
With this feature, Moderators can set a thread not to be archived, it is deemed to be an important thread. Inc. All rights reserved.