ITI 2006 proceedings of the 28th International Conference on Information Technology Interfaces : June 19-22, 2006, Cavtat/Dubrovnik, Croatia / edited by Vesna Luzar-Stiffler and Vesna Hljuz Dobric; organized by University of Zagreb, University Computing Center; [technical editor, Boris Grinfeld]. (University Computing Centre SRCE, University of Zagreb, 2006)