Need Information about Internet Ports, with VB

I want to learn how to create a program that will be able to list the open, or avalable Internet ports my computer has, or has open.
Can anyone tell me a site, or perhaps an API that could lead me somehwere that i can learn about how to do this?

Thanks!
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CzehAsked:
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MTroutwineCommented:
Check out http://www.planetsourcecode.com/vb.  Do a search on "Open Ports".  There is code for two port scanners there.  I personally like the one entitle "Port Watch"!

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CzehAuthor Commented:
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