Locks on Streams
Each stream can have one or more locks on it. A lock prevents a certain set of users from using the stream to create new versions of elements. That is, it prevents execution of the Promote command — either promoting from the designated stream, or promoting to the designated stream, or promoting in either direction.
A lock can be absolute, applying to all users. Alternatively, you can specify that a lock applies to a particular AccuRev user, or to a particular AccuRev group. Conversely, you can specify that a lock applies to everyone except a particular AccuRev user, or to everyone except a particular AccuRev group.
Locks can also prevent reconfiguration of the contents of a stream with the include/exclude facility.
For more on locks, see lock in CLI Help.