Methods and apparatus, including computer program products, for implementing a computer system that provides a model, a first view and at least a second view for presenting the model, a first controller and at least a second controller for manipulating the model. The lower mounting flange is rotated with its mounting tabs riding on the mounting ramps of the upper mounting flange to bring the upper and lower mounting flanges securely together. In a method aspect of the present invention, a muscle relaxant is delivered to a patient through an inhalation route. A first fluid circuit may be provided, which is in communication with the central object-receiving port. The at least first, second, and third layers define a compliance less than that of a single layer balloon made of the first polymer material with a wall thickness equal to the combined wall thickness. 0 \u03bcm at a useful power level using laser light input at a wavelength of from about 1.