Transmit and Broadcast

        <TRN> <Body>
        <BDC> <Body>

Unlike the previous commands, these are not sent over the control link, but rather over links assigned to user programs. The prefix of <TRN> or <BDC> indicates, to the receiving NCP, the disposition of the message body. <TRN> indicates a message to be passed to a single process. <BDC> specifies to the destination NCP that the message is to be distributed over all receiving connections linked to the sender. In response to a system call by the user to an NCP requesting <BDC>, the NCP generates one <BDC> to each HOST to which the sender is connected.