A system is disclosed herein. The system includes an anesthesia machine, and a control system. The control system includes a touch screen, and a computer. The computer is configured to identify a first position at which the touch screen is contacted, identify a control parameter of the anesthesia machine based on the first position, and identify a second position at which the touch screen is contacted. The computer is further configured to identify a contact range comprising a generally continuous sequence of contact points including and extending in a direction away from the second position at which the touch screen is contacted. The computer is further configured to regulate the control parameter of the anesthesia machine based on the contact range.