Messages are communications that are sent from one person or program to another.
Whether you are a system operator or user, you can communicate on your server by using messages. The system operator and users can communicate by sending and receiving messages. System programs use messages to communicate system conditions.
Your server sends informational and inquiry messages that provide you with important system information. Inquiry messages require you to respond. Informational messages allow you to keep track of system activities, jobs, users, and errors. Because messages provide information about your system, you should know how to handle messages when detecting and correcting problems.
You can display, send, respond to, remove, and print messages.