At a conceptual level, IsOneWay=true says that the messaging pattern is ‘fire and forget’ as opposed to e.g. ‘request-response’. That is, IOW=true means there is a message from the client to the server, but not a reply from the server to the client. In contrast, a non-IOW=true method will typically have a response message, even if the return type is void (e.g. an ’empty’ message).