Interactive presentations are being used more and more in all kinds of events. The Interactive Voting System (IVS) affords the possibility of interaction between speakers and audience members, transforming them into active members of the process. Participants are equipped with individual keypads enabling them to respond to questions. Using special software the responses are stored and processed. It is also possible to display the results enriched with diagrams and references. Also worth noting is the fact that voting can be anonymous or open.