=============== Special files =============== **This information is valid for Horde 5 and later only. See `Doc/Dev/SpecialFilesH3`_ for Horde 3 or `Doc/Dev/SpecialFilesH4`_ for Horde 4.** .. _`Doc/Dev/SpecialFilesH3`: https://wiki.horde.org/Doc/Dev/SpecialFilesH3?referrer=Doc%2FDev%2FSpecialFiles .. _`Doc/Dev/SpecialFilesH4`: https://wiki.horde.org/Doc/Dev/SpecialFilesH4?referrer=Doc%2FDev%2FSpecialFiles * horde/lib/core.php: This file * sets some required PHP configuration settings * sets autoloading paths for Horde libraries * registers error handlers There are several files with a special meaning that can be found in every Horde application: * index.php: This script is loaded if a user enters an application. Usually this script doesn't have any functionality but simple loads the default view of the application, sometimes depending on the user's preferences. * lib/Api.php: This files defines and implements all methods that an application is exposing through the `Registry`_ to the other Horde applications and the Horde RPC servers. * lib/Application.php: This file defines information need to initialize the application and to interact with the Horde framework. It also defines the version number of the application. * lib/Exception.php: This file defines the application-specific exception class. * lib/Test.php: This file defines any application specific tests to run when using the Horde test script. * lib/Ajax/Application.php: This file defines the AJAX actions provided by this module. * themes/default/screen.css: This is a CSS file that defines all application specific style sheet rules.