Flash, RealPlayer and Windows Media Player are called plug-ins. Plug-ins are software programs that expand your Web browser's functions. On, for example, we use Flash animations. In order to view these mini-movies, you must have the Flash Player plug-in. Other plug-ins allow you to listen to sound files, zoom in on images, and take advantage of other special features. Any time we include a file that requires a plug-in, we warn you in advance and tell you how to obtain the plug-in software. In most cases, plug-ins are available for free if you are willing to download them from the maker. Be sure to follow the instructions carefully to make certain that your computer is compatible with any plug-ins you download. You can download plug-ins at these locations:

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