port 80 in use code example

Example 1: port 80

Port 80 is one of the most commonly used port numbers in the
Transmission Control Protocol (TCP) suite. 
Any Web/HTTP client, such as a Web browser, uses port 80 to send 
and receive requested Web pages from a HTTP server. It manages
all HTTP-based requests that originate from a computer, regardless 
of the number of requests and initiating Web clients. 
Similarly, the HTTP server responds to all requests received at port 80.

Example 2: what uses port 80

netstat -aon | findstr :80

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Misc Example