System Tasks › SEND System Task › SEND System Task Usage

SEND System Task Usage

Receiving messages

The target user receives the message only if the user's terminal is set up to receive messages. To set up a terminal to receive messages, use the DCUF SET BREAK command.

The message is not sent to the target user when NOBREAK is in effect at that user's terminal. In this case, the sender is informed that the receiving terminal is not set up to receive messages.

Viewing messages

The target user views the message immediately when the user's terminal can receive messages and you send the message with the IMMEDIATE option.

In this case, the message overwrites the terminal's previous screen contents. The previous screen contents are saved when a line I/O session is in progress and backpaging is in effect or when the last active task on the target terminal was defined with the SAVE option. The user presses a control key (for example, Enter or PF1) to restore the screen's previous contents.

When messages get queued at the receiving user's terminal

Messages are queued at the receiving user's terminal in any of the following cases:

• You specify ALWAYS in the SEND command, as described above in the syntax rules for SEND.
• You specify neither ALWAYS nor IMMEDIATE in a message to a user who is currently signed on to the system. In this case, the message is displayed when the current task (if any) at that terminal and the terminal's user presses a control key.
• The intended recipient is already viewing a message. In this case, subsequent IMMEDIATE messages to the terminal are queued. The user at that terminal displays the next queued message by pressing any control key. Queued messages are displayed in the order in which they are received.