What type of authentication is in use?

[aldi]

Hello everyone!!
i have a few questions to make about proxy server 2.0
the proxy server is installed in an nt 4.0 box which is our gateway to the internet.

1) how can i check what type of authentication is in use?
2) what port does the proxy server listen to?
3) how can i tell if sp1 is installed?
4) how to know if the firewall client and the proxy client are installed?

Any input will be appreciated.

thanks,