VS 2008 how to pass the values to browser window both user name and password

I have a VB.net application that at the climax of it calls this in a startnewbrowser function

Code:

Public Function StartNewBrowser(ByVal sURL As Object) As SHDocVw.InternetExplorer



             Dim SUCCESS As Long

         Dim sBrowser As String

        Dim start As STARTUPINFO

        Dim proc As PROCESS_INFORMATION

        Dim sCmdLine As String



        StartNewBrowser = Nothing

        sBrowser = "C:\Program Files\Internet Explorer\IEXPLORE.EXE "

        SUCCESS = 33

        'did sBrowser get correctly filled?



        sCmdLine = BuildCommandLine(sBrowser)



                With start

            .cb = Len(start)

            .dwFlags = STARTF_USESHOWWINDOW

            .wShowWindow = SW_SHOWNORMAL

        End With

                AmisysLauncher.WebBrowser1.Navigate(sURL)



        AmisysLauncher.WebBrowser1.Visible = True

        

        Process.Start("C:\Program Files\Internet Explorer\IEXPLORE.EXE", sURL)

The browser window is called in bold above but just before that happens I have two textbox values one holding a username and the other a password that needs to be passed to the browser window. Now this application is a windows app and not a web app and so I need to know please how to pass the values to the browser session... as I don't think postback or response.redirect is an option. Thanks in advance.