title: How can a client program convert a given well known service to a corresponding port number?
body: <p>One last question from my review. I've been all over the Wikipedia page for TCP and I think this question isn't related to TCP now.</p>
  
  <p>How can a client program convert a given well known service to a corresponding port number (what command is used, and what does the system do to convert the service name)? </p>