Hi Hank
With Broadwave alone, you need to specify the URL of the stream when connecting, either the live stream or a pre-recorded file, as far as I'm aware.
However when you use Broadwave in conjunction with another program to select the audio, it's a very powerful combination.
With XP and a good soundcard which allows "stereo mix" to be selected as a recording device in audio properties, then you use Broadwave to stream the audio being played by the PC. In my case, I use the program Zara Radio (the free version) to play either pre-recorded audio files or select the line in (Zara calls it "satellite input") to relay live audio though the PC's line in connector.