Use 'Lineighbourhood'

Then add machine directly on IP (not the name !)
specify the user and password of the W2K,XP,NT client.

Rightckick on the computer appearing and browse again with the user and password of the W2K,XP,NT client.
Now you'll see the shares (even system shares ).

That's accessing to a windoze share.
(you could use the command 'smbmount' too )

Sharing your linux is something else.

I use the FTP server (together with ssh server).
Code:
 passwd Knoppix
 sudo rm /etc/hosts.deny
 sudo rm /etc/hosts.allow
 sudo /etc/init.d/inetd restart
 sudo /etc/init.d/ssh start
Read out your ip by typing 'ifconfig'
On the windoze FTP client I use Filezilla (from http://filezilla.sourceforge.net/ )
On the windoze ssh client I use putty ( http://www.putty.nl/download.html )