Default The Web server control uses HTML formatting to display a report, while the Windows Form control usespresentation Graphical Device Interface (GDI) to provide a visual experience that is consistent with Windows userformat interface styles.Processing Local report processing is always performed asynchronously in the Windows Forms control. For the Web server control, local report processing is processed through asynchronous postbacks to the IIS server by default, but you can configure it to use synchronous postbacks.Deployment The deployment strategy for reports hosted in the Web server control in an ASP.NET application must take session state and Web farm configuration into account.Browser The Web server control has browser requirements. To use all of the reporting features that are available inrequirements the Web server control, you should use Microsoft Internet Explorer 6.0 or later with scripting enabled. You can use other browsers, but there are some functional limitations in report functionality. For more information.