LISTEN Vs. PORT?

I've finally decided to start dabbling in Apache, and have learned a fair bit about configuring it so far... but I have a question that I can't seem to get a clean answer to anywhere, so hopefully someone can explain it a little better.

In the httpd.conf file, there are obviously the 3 sections that they outline. In Section 1, there is a 'Listen' directive. In Section 2, there is a 'Port' directive.

Now, I want to run Apache on port 8000, and so far only changing Listen to 8000 has worked locally... but when I tried to access the server from my Dad's office, it didn't come up. So now I'm thinking that the reason it didn't was because the 'Port' directive in section 2 was still set to 80. Except that IIS 5 is still running on port 80... and it came up fine.

So my question is, what really *is* the difference between these two directives?

Thanx,

- coredumped.

You really should start here -> http://httpd.apache.org/docs/mod/core.html#port
These days you don't really need to run Apache on another port other than port 80 because Apache understands Host header, thus you can create vhost for different sites. You'd use another port only if your ISP blocks port 80.