The important thing to note here is that for each port you want to use,
you must make a separate "service." I simply name them DCC 1 through DCC
<whatever>. For most people, two ports is fine, so you'd enter 4000 for
the first port, then hit OK, then fill out the same info, only change the name,
to DCC 2, and change the port to 4001. It isn't necessary for you to use 4000,
and 4001, you could just as easily use 12345 and 12346. The important thing is
to make sure the port numbers are consecutive, i.e., don't do 4001 and then 5005.

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