Practice has shown that providing content to students alone is not sufficient for good learning results. In computer based training (CBT) and especially webbased training (WBT) environments - such as virtual universities - the communication between the students and the professors as well as between the students among themselves is very important. We present a Java program that allows the students to communicate and to cooperate on shared documents via the web and that can be used to establish a basic environment for a virtual university. It enables professors to create protocols of the held classes which can be stored in the virtual class rooms. Students can refer to these protocols to e.g. reread a class. Keywords Communication, Collaboration, Java, WWW, Chat, Education, CBT, WBT Motivation In the scenario of computer based training (CBT) for a student it is often not enough to just consume the presented multimedial material. Sooner or later questions and problems occur that the stud...