Article by Joachim Schopfel, GERiiCO Laboratory, University of Lille 3, France; Helene Prost, National Center for Scientific Research, France; Marjorie Piotrowski, University of Lille 3, France; Eberhard R. Hilf, Institute for Scientific Networking, Germany; Thomas Severiens, Institute for Scientific Networking, Germany; Paul Grabbe, Institute for Scientific Networking, Germany