If a user group has this right, then in the context menu "Administration" of MyChat Client (that is called by right clicking on a user's name in the chat) you can see an option "Shut down the client work".
Remote application immediately disconnects from the server and shuts down its work.
In local log of the disconnected client you can see an entry about this event:
[31.05.2017 14:53:06/14:53:07] [WARNING] Received command for shutting down the application (halt)