Tvheadend

I'd like to know where to look to work out just how these talk to each other, so I can answer some questions I have. For example TVHeadend's web interface lets one create multiple configurations, each of which can save the recordings in a different folder, but when viewed via Live TV->Recordings they all appear as one list.

Is this a limitation of the interface between XBMC and its PVR clients, or between the TVHeadend client and TVHeadend itself? I'm happy to dig around in the source code to find answers but I'm not sure where to start.