请将发送端口与发送端口组相关联。
然后客户检查该返回值，确定是否与发送的值相匹配。
The client then examines the returned value to ensure that it matches the value it sent.
消息的接收者可以与发送消息的应用程序同处于相同的机器上或完全不同的机器上。
Recipients of messages can reside on the same machine as the application sending the message or on a different machine entirely.
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