Handout containing an overview of the Cardiovascular Simulator. The Cardiovascular Simulator is a dynamic computer simulation of human cardiovascular hemodynamics,primarily intended for students of physiology and medicine. It is implemented on engineering workstations running the X Window System,allowing the student to perform a variety of measurements in a real-time simulated cardiovascular system,not all of which would be possible in an animal laboratory. The simulation is based on the lumped-parameter mathematical model taught in Quantitative Physiology and Cardiovascular Pathophysiology courses in the Harvard-M.I.T. Division of Health Sciences and Technology. The computer simulation is implemented on the M.I.T. Project Athena student computing network.