Current distance and open learning devices attempt to reduce the difficulties encountered by learners when they follow a distance course. In particular, laboratory experimentation/practice is inconvenient because the students have to be physically present in the university laboratories. In local laboratory experiments, students usually work together in groups of two or more. This learning paradigm is often called collaborative learning. One solution for this problem is usage of virtual collaborative environments which bring together users geographically dispersed but connected via a network.