wheel::run and filter::reference (or filter::stream?)

I am trying to concoct and script that will take a binary data stream from
tcpdump, feed it into a filter,  then in another instance of wheel::run,
hexdump the data stream from the filter.  The code I have come up with so
far is in the 6th entry in the "Continuous packet capture" thread.  I
cannot seem to find an example that explains how this is done.  The first
example I looked at (http://poe.perl.org/?POE_Cookbook/Child_Processes_3)
seems to generate it's input internally.  I have looked at the perldocs for
Wheel::Run and the Filter pages as well as the POE chapter from "Advanced
Perl Programming".  Can anyone point me at another example or explain how
Filters are referenced for input and output?

Thanks,

Jon Polacheck