Need help to set a dummy proxy using Proxycfg

Hi ,

We are planning to block internet access by assigning a dummy proxy on Win2k8 server.

I have read some where Proxycfg.exe can be used to set proxy on Win2k8 server.

Please suggest me how to use Proxycfg.exe to achieve the goal.

Any other options to block internet are welcome. :)

Thanks in advance. 

Sai Krishna