With RIAs, much of the execution of code in Web applications happens on the browser client, and not just the Web or application server, and therefore understanding what is actually happening inside a real browser has become imperative. To understand and measure an application’s performance, most Web monitoring tools try to emulate a user transaction using measurement technologies that use imitation, or emulated browsers.
These imitation browsers mimic, or emulate browsers like IE and Firefox to simulate a site or application visitor’s behavior. While emulated browser measurements have their place when simply monitoring for availability, a complete Web performance monitoring discipline must include both operational monitoring, primarily conducted using emulated browsers, and true end-user experience monitoring, conducted using real browsers.
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