By default WAPT uses embedded Internet Explorer window to record virtual user profiles. In most cases this is the most convenient way, because you do all the things inside one application. When running the test WAPT does not use any browser. It performs all the work itself making the whole process very efficient. It can generate thousands virtual users from a single system, where as it would be hardly possible to launch so many browser instances.
However in real world people use different browsers, and in some cases it is important to emulate a specific one. A web site can deliver significantly different content depending on the client browser. Some sites can be accessed only from a specific browser or a mobile device. […]