ShoutCast servers can return a link to a webpage describing the station's information. It could be simply a list of songs that are playing, station information, or in some cases, interactivity such as chat or rating music. Although you could get to this homepage through a service such as Shoutcast, you could have also started Streamer through a playlist file you saved earlier, and this button will take you to the stream's webpage.
This feature requires that you have installed openurl.library The button will be inactivated if Streamer is not connected to a ShoutCast server; only ShoutCast servers will return a homepage for the station.