Of course,
I was talking about setting up an dynamic dns internetservice such as dyndns.org.
The problem with dyndns.org (and others) is for updating you need a login and password (which is good) but the password is for the complete domain,.....
Let's say we want to set up a dynamic dns system with the domainname example.com
We would like have a seperate updatelogin and password for each record: client1.example.com, client2.example.com,.....
Not possible with dyndns.org unfortunately, Their answer is: We don't support reselling,... which I understand.
The only way is to set up such a system ourselves I guess,...
I'll look into the info you gave, thanks,.......