+\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 classes}}
+
+\twocolwidtha{6cm}
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\helpref{wxXmlDocument}{wxxmldocument}}{A class to parse XML files.}
+\twocolitem{\helpref{wxXmlNode}{wxxmlnode}}{A class which represents XML nodes.}
+\twocolitem{\helpref{wxXmlProperty}{wxxmlproperty}}{A class which represents XML properties.}
+\end{twocollist}
+
+{\large {\bf XML-based resource system classes}}
+
+\overview{XML-based resource system (XRC) 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}
+
+wxWidgets provides a set of classes for accessing Microsoft's ODBC (Open Database Connectivity)
+product, donated by Remstar. This is known as wxODBC.
+
+\twocolwidtha{6cm}
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\helpref{wxDb}{wxdb}}{ODBC database connection}
+\twocolitem{\helpref{wxDbTable}{wxdbtable}}{Provides access to a database table}
+\twocolitem{\helpref{wxDbInf}{wxdbinf}}{}
+\twocolitem{\helpref{wxDbTableInf}{wxdbtableinf}}{}
+\twocolitem{\helpref{wxDbColDef}{wxdbcoldef}}{}
+\twocolitem{\helpref{wxDbColInf}{wxdbcolinf}}{}
+\twocolitem{\helpref{wxDbColDataPtr}{wxdbcoldataptr}}{}
+\twocolitem{\helpref{wxDbColFor}{wxdbcolfor}}{}
+\twocolitem{\helpref{wxDbConnectInf}{wxdbconnectinf}}{}
+\twocolitem{\helpref{wxDbIdxDef}{wxdbidxdef}}{}
+\end{twocollist}