To maximize your testing coverage, you distribute Vusers over several load generator machines. A load generator machine is a machine upon which the Remote Agent Dispatcher (Process) and a LoadRunner Agent are installed.
When you run the LoadRunner installation, you specify to install only these components. These components allow Controller to communicate with the load generator machine.
Remote Agent Dispatcher. The Remote Agent Dispatcher (Process) enables Controller to start applications on the load generator.
Agent. The LoadRunner Agent enables Controller and the load generator to communicate with each other. When you run a scenario, Controller instructs the Remote Agent Dispatcher (Process) to launch the LoadRunner agent. The agent receives instructions from Controller to initialize, run, pause, and stop Vusers. At the same time, the agent also relays data on the status of the Vusers back to Controller.