Event Driver
The event driver is the interface and conduit between the Rendezvous API and the operating system. It runs indefinitely, waiting for timer and I/O events from the operating system. It processes those events, matching them with Rendezvous event objects, and placing the appropriate event objects in their event queues.
The Rendezvous open call automatically starts the event driver, and the final close call terminates it. Your program does not control the event driver.