On openSuse wiki I have found the following
To prevent the accidental starting of KDE4 applications within a KDE3 session add at the top of /opt/kde3/bin/startkde
So, as I understand, it means that it is possible to have kde3.x and kde4 (beta) installed separately on 1 OS. Unfortunately, I couldn't find anything that explains how to setup another session type in SuSE 10.2 =(( It would be great, because so far I have just a big mess with different KDE packages installed, but still, I want to use KDE4 packages.
Any help?

Thanks