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When I use the "bytes sent since last PSH flag"?

Hi,

Please explain to me how can I use the "bytes sent since last PSH flag" in TCP [SEQ/ACK analysis] info.

As far as I know, We can refer to the "Bytes in flight" filed to get the picture for the Congestion window.

I found in my trace that the "bytes sent since last PSH flag" field value and "bytes in flight" field one show different values.

Please explain to me what is the case those two filed show different values.

Thank you in advance. Yves