You can use jrs.report_sheet$RPT_NAME=true to specify a specific report in the current report set, where RPT_NAME is the report name of the specific report, not the display name. To get the report name and display name of a report, you can make use of the API methods getName() and getDisplayName() in the interface jet.server.api.ReportSheetInfo. For the detailed usages, see JReport Enterprise Server Javadoc located in <install_root>\help\server\en\api.
The URL for running a report Applet within the report set MultimediaObjects.cls is as below:
http://localhost:8888/jinfonet/tryView.jsp?jrs.cmd=jrs.try_vw&jrs.catalog=%2fSampleReports%2fSampleReports.cat&
jrs.report=%2fSampleReports%2fMultimediaObjects.cls&jrs.result_type=8&jrs.report_sheet$Report1=true
or
http://localhost:8888/jrserver/SampleReports/SampleReports.cat/MultimediaObjects.cls?jrs.cmd=jrs.try_vw&
jrs.result_type=8&jrs.report_sheet$Report1=true