We sat, horrified, until at last we found the “baby monitor” my son had left behind, the apparatus under the bed, the receiver in our TV room, to hear whether the baby was crying.
Notice that under a messaging paradigm; most of the security aspects can be made transparent to message sender and receiver.
注意，在一个消息传送范式下，大部分安全方面对于消息发送方和接收方都可以是透明的。
3
A sequence can be thought of as the "reliability contract" under which the RMS and RMD agree to reliably transfer messages from the sender to the receiver.