accessing a webservice through a proxy server

[Ravi Krishnamurthy]

Hello:
There are some webservices that needs some authentication to access the 
wsdl itself. Could anybody point me to some examples on how to get hold 
of the wsdl.
In my project we need to develop a configuration and runtime for 
webservices that helps the users to navigate through the webservice and 
choose what operations to want to use etc.

This is very urgent and I would appreciate any help on this.

Thanks,
Ravi