There really isn't any tool. Any Remotely callable function module is exposed as a web service. Take a look at the following node in the Service Tree (SICF) sap->bc->soap. The RFC node is actually the request handler. You will also see a WSDL and documentation node. You probably also want to look at the BSP application WebServiceBrowser. You should note that I believe this all works much different in WAS 640. There are some screen shots from TechED that detail this in greater detail that available on SDN.
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