Thank you Matti for this virtual community kick-off. Let's check out the system together and see how it works. Keep in mind, that it should also work with lots of people more. However if anybody has knowledge of some other free community software please post it. Success.
The possibilities of the froum are rather one-dimensional, it seems, that one can only post a discussion and reply to one, but there is no chance of replying to another reply (as it is possible in Moodle or the K3-Forum for example).