dyn. dns-update

[Tom Horstmann]

Is there a way to update dns without restarting and without
nsupdate?? I tried just editing the .hosts-file but this 
seems to be cached by local dns with any SOA-values. 

nsupdate does not seem to work the way i did it:
----
update delete test2.domain.de A
update add test2.domain.de 30 A 62.96.170.43

---
The .hosts-file is the same before and after.


Surely this question has been here many times, but i couldn't
find anything in the archive.


Regards,

TomH