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\part{Special files}
\textbf{This information is valid for Horde 3 only. See Doc/Dev/SpecialFilesH4 for Horde 4 or Doc/Dev/SpecialFiles for Horde 5 and later.}
\begin{itemize}
\item \texttt{horde/lib/core.php}: This file
\begin{itemize}
\item sets some required PHP configuration settings
\item loads libraries required by all Horde applications
\item instantiates the global Browser object
\end{itemize}
\end{itemize}
There are several files with a special meaning that can be found in every Horde application:
\begin{itemize}
\item \texttt{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.
\item \texttt{lib/base.php}: This file is loaded from every script of the application. Its purpose is to:
\begin{itemize}
\item define some global constants
\item load \texttt{core.php}
\item initialize the Registry
\item redirect to the login screen if the user is not authenticated and guest access is disabled
\item load common Horde libraries
\item initialize the Notification System
\item load common application specific libraries
\item initialize common global application specific objects and variables
\item start output compression
\end{itemize}
\item \texttt{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.
\item \texttt{lib/version.php}: This files defines a single constant: the application's version number.
\item \texttt{templates/common-header.inc}: This is the common page header template for all scripts of the application. All applications use the same page footer template \texttt{horde/templates/common-footer.inc}.
\item \texttt{themes/screen.css}: This is a CSS file that defines all application specific style sheet rules.
\end{itemize}
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