We need to invoke a webservice method that will call an sp that may run
up to 1 hour so we want to start the sp then let the client continue
working.  I have read about the OneWay:=true but calling the webservice
it seems to still wait until the service is finished before returning
to the client.  Any ideas? - Code below..

In the webservice we define this method:

<SoapDocumentMethod(OneWay:=True), _
      WebMethod(EnableSession:=True, Description:="STX processing of
imported invoices.")> _
   Public Sub StartProcessingInvoices()

  --code to run the sp which works as needed

   End Sub

In the codebehind aspx page:

           'Final call to webservice to start processing inported data
           Dim wsInvoices As New STXProcessInvoices
           Dim resultMessage As String

           wsInvoices.StartProcessingInvoices()

          ...continue processing and displaying the aspx results page
to the client