This chapter describes the aspects of the Macintosh interface that are essential to its "feel." It covers the interaction between the user and the computer, detailing how the computer should respond. This chapter contains information about the mouse and the pointer, the keyboard, and the behavior of different types of objects such as text, graphics, and arrays. It discusses the behaviors associated with the primary user input devices--the mouse and keyboard. It also describes responses generated by your application, such as selection behavior and keyboard navigation through lists.