rfc1036 December 1987

4.1.  Remote Execution

    Some networks permit direct remote command execution.  On these
    networks, news may be forwarded by spooling the rnews command with
    the message on the standard input.  For example, if the remote
    system is called remote, news would be sent over a UUCP link
    with the command:

                    uux - remote!rnews

    and on a Berknet:

                    net -mremote rnews
    It is important that the message be sent via a reliable mechanism,
    normally involving the possibility of spooling, rather than direct
    real-time remote execution.  This is because, if the remote system
    is down, a direct execution command will fail, and the message will
    never be delivered.  If the message is spooled, it will eventually
    be delivered when both systems are up.