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The Pictorial Computing Laboratory (PCL) evolves its past experience in image processing and pattern recognition to the design of interactive systems. In the last ten years, a model for visual interactive computing has been developed based on the following abstraction: in interactive activities human beings communicate with computers through digital messages representing (part of) the state of the computation. Such a model, called Com 2 , is described, and an interaction with a system, developed following it, is shown as example, thus highlighting the use of visual languages for human-computer interaction.