+{\large {\bf Virtual file system classes}}
+
+wxWindows provides a set of classes that implement an extensible virtual file system,
+used internally by the HTML classes.
+
+\twocolwidtha{6cm}
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\helpref{wxFSFile}{wxfsfile}}{Represents a file in the virtual file system}
+\twocolitem{\helpref{wxFileSystem}{wxfilesystem}}{Main interface for the virtual file system}
+\twocolitem{\helpref{wxFileSystemHandler}{wxfilesystemhandler}}{Class used to announce file system type}
+\end{twocollist}
+
+{\large {\bf XML-based resource system classes}}
+
+\overview{XML-based resource system overview}{xrcoverview}
+
+Resources allow your application to create controls and other user interface elements
+from specifications stored in an XML format.
+
+\twocolwidtha{6cm}
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\helpref{wxXmlResource}{wxxmlresource}}{The main class for working with resources.}
+\twocolitem{\helpref{wxXmlResourceHandler}{wxxmlresourcehandler}}{The base class for XML resource handlers.}
+\end{twocollist}
+
+{\large {\bf Online help}}
+
+\twocolwidtha{6cm}
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\helpref{wxHelpController}{wxhelpcontroller}}{Family of classes for controlling help windows}
+\twocolitem{\helpref{wxHtmlHelpController}{wxhtmlhelpcontroller}}{HTML help controller class}
+\twocolitem{\helpref{wxContextHelp}{wxcontexthelp}}{Class to put application into context-sensitive help mode}
+\twocolitem{\helpref{wxContextHelpButton}{wxcontexthelpbutton}}{Button class for putting application into context-sensitive help mode}
+\twocolitem{\helpref{wxHelpProvider}{wxhelpprovider}}{Abstract class for context-sensitive help provision}
+\twocolitem{\helpref{wxSimpleHelpProvider}{wxsimplehelpprovider}}{Class for simple context-sensitive help provision}
+\twocolitem{\helpref{wxHelpControllerHelpProvider}{wxhelpcontrollerhelpprovider}}{Class for context-sensitive help provision via a help controller}
+\twocolitem{\helpref{wxToolTip}{wxtooltip}}{Class implementing tooltips}
+\end{twocollist}
+
+{\large {\bf Database classes}}
+
+\overview{Database classes overview}{odbcoverview}