Execution method of report created using Web Intelligence

Hi everyone,

Could anyone please let me know of the way data in a report created as web intelligence document is refreshed? Is it real-time data each time the report is executed or do I have to explicitly hit the "Refresh" button in order to get latest data?

In case data is cached and renewed only when "Refresh" is clicked, which execution of the report is taken for the cache - let's say in case 100 users access the same report.

Thanks,

Maria