The saw url (Siebel Analytics Web) is the base url that command BI Presentation Service and call different (modules|applications|command)
http://localhost:9704/analytics/saw.dll?Cmd
Where Cmd can be:
You may have different url parameters depending on the module. It's then an API.
Any URL parameters, nQUser, nQPassword, Impersonate take precedence over SSO authentication.
An URL must be encoded before that you can use it.