protocol link with username information

Hi all,

I am doing some work with protocol link.

My question is "How to pass the username and password information from the Portal page to the PP protocol with the url below?"

http://server:9944/webport/default/main.htm?protocol=Protocols/Web%20Services/SomeFolder/MyProtocol ...

For example,users could login the system A and click the protocol link to open the new window to display the protocol results,who have the access to the PP protocol.

Thanks

sunny