Switch between Volume Control, Pressure Control, and Pressure Support — each with its own set variables — driving a real single-compartment lung. Enter height, weight and sex for predicted body weight and lung-protective tidal-volume targets. Load a pathology, then explore the best-PEEP curve: too little PEEP derecruits (atelectasis) and too much overdistends — both stiffen the lung and drop SpO₂. Use the inspiratory and expiratory holds to measure plateau pressure and auto-PEEP, and turn on the live P–V or F–V loop.