Program that monitors what programs are on what ports!

I'd like to create a program that monitors processes that are running on what ports on my computer. I actually had a program on my computer, though I can't recall who made the thing.

Again, I want to see what my computer is running on certain ports - my question is: What sort of programming knowledge will I need to do something like this? More importantly - how can I do this?

I'm running windows, so I imagine the msdn will be a big help - but what should I search for?

Sounds just like netstat.
Comes pre-supplied as part of your XP installation.

Quote:

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Originally Posted by Salem

Sounds just like netstat.
Comes pre-supplied as part of your XP installation.

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Well yeah, that's fine - but I want to do something like that on my own. A bit of a learning experience if you will.

EDIT: The program that I had on my computer was not netstat but a free tool made by some security company.
EDIT2: The program is called 'fport' and is available here: http://www.foundstone.com/