1 1 A control panel module is a component of the Macintosh Control Panel, that portion of the Macintosh interface which allows users to observe and change system wide parameters, such as the speed of mouse- tracking and the volume of speakers. Setting the time on the system clock is a function of the Control Panel, which led to the inclusion of the Map program with its database of time zones. The Macintosh interface guidelines constrain a control panel module to be entirely self- contained inside a pane of the Control Panel's window.