The success of teaching is depending on a couple of factors where collaboration among all participants, teachers and students are the most important ones. With mobile devices and wireless networks, new possibilities evolve for improvement. By promoting existing concepts of application sharing systems, the project SASCIA (System architecture supporting cooperative and interactive applications) aims at developing a framework for multiple applications to support teaching in collocated, remote and hybrid scenarios. It provides annotation and recording to support latecomers and further exceptions as well as subsequent replay. Moreover, configurable context awareness among participants as well as floor and consistency control cover a wide spectrum of applications and learning situations. According to first experiments, the prototype is performing well and was readily accepted by students.