Hi Greg, thank you very much for your explanation. It makes many things more clear for me. Not every thing is covered by the documentations, and during the times, debian developers changed things or made decisions of behaviour, to make the system better.
I appreciate this very, very much (one of the reasons, I prefer Debian) and although I am using debian now for many years, i am still learning new things, which let me better understand. Like here! So again, thank you very much again for the explanation, it made everything crystal clear. This little issue is fully solved. Best regards and have a nice week! Hans