When a caller issues SSI function code 75 to send a message through networking facilities, the requesting program uses network job entry (NJE) services provided by MVS/JES. In an MVS™ environment, the TSO/E user is typically the recipient of these messages. For example, when a program reaches a particular place in its processing that the user wants to know about, the caller issues the SSI function code 75, and a message is sent to the user notifying them of this event. The text of this message is free-form.