When passing SQLRS report parameters through the URL be sure to use the ReportServer and not the Reports

Want to pass hidden parameters to an SQLRS report in a browser?
Just add the parameter name and value to the query string pointing at the ReportServer URL like so:

http://reportingserver.aparcsystems.com/ReportServer/Pages/ReportViewer.aspx?%2fReports%2fTransactionDetails&rs%3aCommand=Render&PARAMNAME=PARAMVALUE