Model editor
The concepts and the interface are define in the user manual. This is the only complex part of the system. Thus first try to understand the concept before stating to edit such a model. Over, it is a good practice to edit a new model in a copy context of the normal one. On can exercise the new model in several simulations. Then when the model seem to be good, on can copy back the ``document_patterns.dmp'' in the normal data directory.