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An Administrator may broadcast message in linux in order to insure that all connected users receive a ubiquitous message informing them of an important communication item.
Here is an example of a halt/shut down of a system where an administrator broadcast message in linux in order to get the information to all connected users that the system will be shut down:
[root@servername tmp]# shutdown -hy 0 Broadcast message from root (pts/0) (Sat May 28 10:15:27 2006): The system is going down for system halt currently. [root@servername tmp]#
For more information on Linux,Unix, and Fedora view the following articles/links: