1. An apparatus for analyzing touch screen users based on characterization of features derived from a touch event the apparatus comprising: a touch sensitive screen for detecting a touch event from at least one user, said touch sensitive screen having two touch regions; at least one sensor generating a vibro-acoustic waveform signal from the touch event; a converter for converting the waveform signal into a domain signal; a feature extractor for extracting distinguishing features from said domain signal; and a plurality of classification units which use the distinguishing features of said extractor to analyze the features of the domain signal, a first classification unit configured to classify touch events occurring within a first touch region and a second classification unit configured to classify touch events occurring within a second touch region and not configured to classify touch events occurring within the first touch region, wherein the first touch region is distinct from the second touch region, wherein the first touch region is everywhere proximate to an edge of said touch sensitive screen, wherein the second touch region is all remaining area of said touch sensitive screen not including the first touch region, and wherein if any portion of the touch event is in the first touch region, the first classification unit is configured to classify that event.