Open command window to directory of open file

A couple months ago, I was wandering around the help pages looking for
something (no idea what now) and I stumbled upon something SOOO cool,
that I really had wished I had known it for the last ten years.

I, then, promptly forgot what it was (the exact command, not the
functionality) and have not been able to re-find it to save my life!!

It was (I think) some : thingy, that upon hitting enter a command/cmd/
DOS window (I'm running gvim in XP) would pop open, already sitting in
the directory in which the file open in the current buffer resides.
In other words, if I had a file open like: c:/somedir/someotherdir/
somefile.ext and I typed the :magic-word and hit enter, a command
window would pop open to the directory: c:/somedir/someotherdir/

Might anyone know the :magic-word?

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