Message activities, that is receive, reply, invoke, and pick activities, can initialize or verify correlation set values with their input and output message.
2
存在三个不同的选项,默认值是长期运行(请求-应答)。
There are three different options available, and the default is Long-running (request-reply)
3
在传输延迟的应答时客户机选择SACK选项的值。
The client selects the value of its SACK options whenever transmitting a delayed ACK.