To demonstrate the interaction between the WC and the WCS, it's easiest to review the process of displaying a Crystal Report on a Crystal Viewer to examine exactly what traffic is being passed between the browser, Web server, WC, and the Crystal Enterprise report processing tier.
A request is made from the browser to the Web server for a specific report viewer. In this example, the user has clicked on a hyperlink (http://<Server Name>/directory/viewrpt.csp&rptid=1863), meaning that a request has been made to view a Crystal Report within the Crystal Viewer.
The WC on the Web server forwards the request to the WCS.
The WCS processes the CSP and calls the Crystal Enterprise SDK to invoke a report viewer object, ...