That is NOT a process ID, it is the port number. "192.168.11.41.37274" is a "socket": a certain port on a certain IP address.
When we talk about "TCP connections" we are talking about something you can picture like a garden hose, where, instead of water, data can be pumped through (in both directions). This is also called a "virtual channel". The "sockets" are the end points at the two connecting systems where this garden hose is attached. In this case you have two systems connected: 10.61.1.121 and 192.168.11.41. The "garden hose" connects port 80 on the first system to port 37274 on the second.
You really should read the suggested book (or another, but i found this one to be the best to learn from) to understand basic networking concepts.
I hope this helps.
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