I've just been trying kerjodando p2p at a few Internet cafés and I found these three issues:
1) When you click the " click here to start kerjodando: start " (on the test itsDargens.com page ) it gave an error. To get it to work I had to do "save as" and then open downloaded file.
2) Once the client was open it took a long time to connect so in the end I did "Connect to Neighbour address" in advance mode.
3) Dargens did not check that I had the latest version of Java installed.
Once I connected I could download MP3s and videos faster than bit torrent.
Hope these hints are helpful to alpha testers.