I'm not sure about Active Directory, but you can make a RedHat 9 box join a windows domain using Samba. Details on setting up samba can be found on the
Samba HOWTO Collection page. Once it's configured, the command to join a domain is:
smbpasswd -J <domain name>
For browsing the network on the command line, use smbclient. It's an ftp-style interface to windows shared directories.
smbclient -U <username> //<machine>/<share>
From there, you can move through the directories just like you were using ftp.
Alternatively, there are several browsers for X Windows that will allow you to browse Samba shares. The protocol is smb://. So, for example:
smb://<hostname>/<share>
I haven't had much luck getting those to work, though.
Hope this helps!
-- Kintar