Capture key press events with ExtendScript?

Is it possible to do this?  I can't find an example in the documentation or online anywhere.  I'd really like to know when the user presses the arrow keys while viewing the slideshow in Bridge.
Thanks!

Thanks for the example Paul.  I can see how to listen to key down events on Windows and Dialogs that I create.  Do you know of way to listen for global (app-wide) key down events? These are not defined:
app.addEventListener('keydown',...)
app.document.addEventListener('keydown',...)
I'm trying to add to the slideshow mode by having a little palette dialog with the context information shown that I need.  The default caption box doesn't have what our artists want.  If the palette window is in focus, I get the keydown event, but if they're using the arrow keys to flip through the slideshow, I can't capture those.
Thanks for the help.

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