Who has port X open?

[John Chambers]

Not to change the subject or anything, but in the midst  of
the deep philosophical debate, does anyone happen to know:

How can I tell what program has port X opoen?

There are some ports open that I can't identify.  I do know
that  netscape likes to keep ports open long after I've hit
the back button.  But it'd be useful to be able to see  who
is talking to whom. Some of those connections might be good
to shut down.

I've learned the answer to this question  on  a  number  of
other  unices,  and  so  far  every  one  of  them has been
different.  I don't seem to see the answer anywhere in  the
linux docs, and I'd expect that there's a way to do it.

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