A vehicle computer system includes a display device that is configurable for viewing by a driver of a vehicle while the vehicle is moving. The display device is responsive to a processor that executes application programs in conjunction with an operating system. A plurality of sensors are used to indicate the position of the display device, to indicate vehicle motion, and to indicate the state of a chosen vehicle control such as a parking brake. Application programs open display windows in conjunction with the operating system. In opening a window, an application program can indicate whether the window will contain driving-related information. The operating system monitors the sensors and prevents the display of non-driving-related windows to the driver when the vehicle is in motion or when it has the potential for motion. Specifically, the operating system in such a situation hides any windows that have not been specified as being driving-related. Initially, all windows are assumed to contain non-driver related information; hence, they are hidden until it is determined what type of information they display.