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You're still not understanding how telnet works

What you posted is a telnet client

You can telnet to any port, and, if it's listening, interact with it (if it accepts plaintext information)

For example, you can telnet to port 25, and directly interact with a mail server (if it's listening)

Or to see if a system is listening on port 80, do the following:

telnet <host> 80 

And now you're a "web client" talking to a web server