Hi Johannes,
Any Scene recall on dLive will trigger a MIDI Program Change message where the Program number is the number of the Scene (in hex). This is transmitted over TCP/IP. If you are using a Mac, you can download the A&H MIDI TCP driver, which will create a virtual MIDI port in OS X, and you can then learn / assign the Program Change message as required. We don’t have an equivalent utility for PC at the moment I’m afraid.
For details on the MIDI messages and their format you can download the GLD MIDI protocol, which is nearly identical.