Sending arbitrary XML messages to a Web Service

[jembutos]

I'm trying to test the integration of several different systems. In particular, there is a web service that another system will use to pass messages from a fairly simple web form. However we will not be able to test their actual integration until the last moment. I am therefore receiving fully constructed XML messages from the one system, and would like a way to manually send them to the web service myself as directly as possible.Is there a tool or a way I could accomplish this? It is not enough in this case for me to consume the service with an VS application and send messages in this fashion. Instead I need to test that the one service is constructing its messages correctly and I need to send them to the service on that systems behalf.Thanks