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404 Part II: Developing Intranet Solutions . Keyword search: The system will allow keyword-based searches using the logic operators AND and OR. . Template-based interface: The system should support a central help template to display help pages but also allow individual sections to have their own templates to alter the look and feel of the help as needed. Understanding the Prerequisites The help system requires the application framework classes that were discussed in Chapter 4. You must have the application framework classes along with PHPLIB and PEAR packages installed. Designing and Implementing the Help Application Classes As shown in the system diagram, Figure 12-1, there is one new object, Help object, which is needed to implement the online help system. Help Application Make Index Application PHP Application Framework Help Applications Help Object class.Help.php Figure 12-1: The help system diagram. Here you will develop the class that will provide the help object for the online help applications. Designing and implementing the Help class The Help class is used by all help applications. It allows help applications to display, search, and index help contents. The ch12/apps/class/class.Help.php file on the CD-ROM implements this class. This class implements the following methods.