Key element in online education to activate students with real-time tools

Corona-19 virus changed our world. Education had to move to digital world which was a drastically change for each of the participants, both educators and students. A real-time VCS (Virtual Classroom System) offers a lot of functionality to organize lessons. Though using them at the first time the experience differs from the classical face-to-face teaching - the joy of common work is not so intensive this way neglecting the personal contact. We made a student survey about the usage, the advantages and disadvantages of VCS in our university in spring and in the autumn semester as well. In this paper we publish our results and give suggestions how to make the teaching even better.