http://kasapi.kasserver.de/dokumentation/
Intention: Make isset($_GET["xxx"]) instead of $_GET["xxx"] to get rid of PHP Notice warnings
Base http://kasapi.kasserver.de/dokumentation/demodownload/schnittstelle-2013-02-27.zip
Point your webserver to
./pages as web reachable root
./pages/index.php as Index pages
./inc/*