10.3.1 RBTelco RBTelco, among its other customer offerings described in the previous use cases, provides access to the Stock Quote Web service hosted by RBStocks. 10.3.2 RBStocks RBStocks hosts the Stock Quote Web service, which can supply either 15-minute delayed quotes or real-time quotes. RBStocks maintains a custom blacklist, which is checked during client authentication to prohibit access to anyone that has been barred from use of the service. 10.4 Interaction description Figure 10-7 on page 304 depicts the interaction between a WebSEAL server, the WebSphere Application Server hosting the Web service client, and the WebSphere Web Service Gateway, all located at RBTelco with the WebSphere Application Server at RBstocks, which hosts the Stock Quote Web service.