1.1 Basic elements and data structures
The appearance of pop-up menus is defined by the Window Tool Kit. To make a pop-up menu, you only need to specify a list of menu options. The Window Tool Kit automatically displays the options in pop-up menu form when the appropriate function is called. Experienced Lisp users can change the appearance of user-specified pop-up menus as desired. Chapter 5, "Pop-Up Menus" presents information about customizing a pop-up menu.
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