Hi Rahmu,
I started to use Novell Suse in 2004 but before that and since 1999 I used Novell 3.11 and the Y2K version 3.12 which I was the team lead in upgrading over 43 Novell servers to Y2K in year 2000.
In 2002 Novell NDS 4.x has been released. The 3.X was called Bindery and the 4.x is NDS and any one who knows NDS tree and it's Domain it's easy fro him to understand the Microsoft tree and it's forest structure
http://technet.microsoft.com/en-us/library/cc977994.aspx because Microsoft is upside down the Novell NDS tree
Please do not hesitate to ask any question I will be glad to help you
Rouhi