Hi, Mark. Well, I will try and explain ports without going in to a major discussion of computer networking. Here is the short version of it. Every program that works on a computer network, say the internet, broadcasts on and connects via what is called a port. For example, when you fire up your web browser and go to www.somewhere.com your web browser connects with the servers port 80 which handles http stuff via a web hosting software like apache or IIS. When you use your email say sending email it connects to your mail server on a different port, port 25 SMTP, which is where sendmail, postfix, exem, and other mail transport server software lives. Well, other programs residing on your computer may connect on a different port. For example, mud clients run on port numbers usually above 5000. Simplest answer, is it is kind of like a private phone extention for a program service trying to be reached. Look at it this way. You can dial somewhere.com port 22: admin secure shell. port 25: sending mail. port 26: logged in via telnet. port 80: viewing web page. port 5000: playing game. So depending on what port you are connected to will determine if you can access ftp, ssh secure shell, sending mail, viewing web content, playing a game, etc....
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