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Example of the Telnet Service

telnet 80

Note: this launches telnet and tells it to look up and connect to the server for "" on port 80.
User logs on to a UNIX machine A

User contacts remote machine B using telnet service. User can now work on the remote machine B.

Telnet is organized as a client-server transaction. User on machine A types to a telnet client process running on machine A.
The client process passes data across the network to the server process running on machine B.

The server process on machine B acts on the commands it receives, and passes the replies back to the client process on machine A.