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Sends a display message to a TACL process.
The message displayed by the receiving TACL be preceded by "FROM: <process>", where process is the process name of the TACL from which the message was sent. This can be disabled by including the NOIDENTIFY option.
The receiving TACL process will display the message prior to the next time it displays a TACL prompt, which in the case of a TACL sitting at its TACL prompt, would be the next time <enter> is pressed. The receiving message can be made to display the message immediately when sitting at a TACL prompt or when paused by sending it a system BREAK message using the BREAK product.