Your questions appears to indicate that you are unfamiliar with the role of WSDL and perhaps web services in general. You would probably benefit from some good material on web services basics and web services security. Before reading the Web Services Developer’s Guide provided by WM, I would search the web for some basic tutorials or primers to help put things in perspective.
When a soap client (web service consumer) posts a message to a web services provider, it can use the HTTP protocol to supply credentials for basic authentication. It can also include a username token in the request header (soap:header) if the service requires WS-Security message-level authentication.
IS 6.5 does not support WS-Security out of the box, but you must provided at least basic authentication credentials to invoke an IS Flow or Java service using HTTP.
Mark
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