The Finder represents files and folders to the user through icons. You can add custom icons to your project to make it easier to identify your application and its associated document files. First you create the icons with a graphics program and store them in an icon file by using the Icon Composer application. Then you add the icon files to your project and add entries to the application’s property list so that the icons will be recognized by the Finder.
By now you should have a complete, functioning Moon Travel Planner application with is own cool icon. We’ll finish up in the next chapter by introducing a few advanced topics to whet your appetite to create you own application.