The sign on/off device *beta is part of a web-based system called "TransPortal" which was created within in a study project in the field of "Digital Media" at the University of Bremen. The corresponding website can be found under the following URL: http://transportal-dev.informatik.uni-bremen.de/home . It is not fully functional yet but the project team is still working on it and will upload the final version once it is done. For further information about the project please have a look at the project report provided in the documents.http://vimeo.com/91733190