Security Basics: Prevent use of Open Share

["Alex Harasic Gil" <alharasic () mi cl>]

Hi, the company I'm working for has over 8,000 PCs 
connected to the corporate LAN. We need to find a way to 
prevent users from creating Open Shares with full-access 
permissions on the Windows 2000 network.
Basic users, don't know how to apply control access to the 
shares they're sharing. So, there's also an education 
process we need to carry on.
But for a first instance, how can I do to lock the use of 
public open shares on the windows 2000 Domain? Domain 
Policy, GPO?, is there any way to detect the use of them 
other than scanning for open shares?.
Regards

Alex S. Harasic
alharasic () mi cl