Reporting Services uses browser sessions to maintain consistency while viewing reports. Sessions are based on browser connections, not authenticated users. A new session is created each time a user opens a report in a new browser window. Once a browser session is established, you continue to work with the version of the report that was opened when the session began, even if the report is modified on the report server. For example, if you open a report at 11:00 P.M., and a report author republishes the same report at 11:01 P.M., your session will contain the version that you opened for the duration of the session.
If you refresh a report within the same session using the browser's Refresh button, the original session version of the report is displayed. If you refresh an on-demand report using the Refresh button on the report toolbar, the report is re-run and new data, if any, is displayed. Different refresh options produce different results. For more information, see Viewing Reports.
Session information is stored in the report server temporary database. The report server does not use ASP.NET session management. If you restart the server or perform a database recovery operation, session state is not restored. For more information about session management, see Identifying Execution State.