+\twocolitem{\helpref{wxDir}{wxdir}}{Class for enumerating files/subdirectories.}
+\twocolitem{\helpref{wxFile}{wxfile}}{Low-level file input/output class.}
+\twocolitem{\helpref{wxFFile}{wxffile}}{Another low-level file input/output class.}
+\twocolitem{\helpref{wxTempFile}{wxtempfile}}{Class to safely replace an existing file}
+\twocolitem{\helpref{wxTextFile}{wxtextfile}}{Class for working with text files as with arrays of lines}
+\end{twocollist}
+
+{\large {\bf Stream classes}}
+
+wxWindows has its own set of stream classes, as an alternative to often buggy standard stream
+libraries, and to provide enhanced functionality.
+
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\helpref{wxStreamBase}{wxstreambase}}{Stream base class}
+\twocolitem{\helpref{wxStreamBuffer}{wxstreambuffer}}{Stream buffer class}
+\twocolitem{\helpref{wxInputStream}{wxinputstream}}{Input stream class}
+\twocolitem{\helpref{wxOutputStream}{wxoutputstream}}{Output stream class}
+\twocolitem{\helpref{wxCountingOutputStream}{wxcountingoutputstream}}{Stream class for querying what size a stream would have.}
+\twocolitem{\helpref{wxFilterInputStream}{wxfilterinputstream}}{Filtered input stream class}
+\twocolitem{\helpref{wxFilterOutputStream}{wxfilteroutputstream}}{Filtered output stream class}
+\twocolitem{\helpref{wxBufferedInputStream}{wxbufferedinputstream}}{Buffered input stream class}
+\twocolitem{\helpref{wxBufferedOutputStream}{wxbufferedoutputstream}}{Buffered output stream class}
+\twocolitem{\helpref{wxMemoryInputStream}{wxmeminputstream}}{Memory input stream class}
+\twocolitem{\helpref{wxMemoryOutputStream}{wxmemoutputstream}}{Memory output stream class}
+\twocolitem{\helpref{wxDataInputStream}{wxdatainputstream}}{Platform-independent binary data input stream class}
+\twocolitem{\helpref{wxDataOutputStream}{wxdataoutputstream}}{Platform-independent binary data output stream class}
+\twocolitem{\helpref{wxTextInputStream}{wxtextinputstream}}{Platform-independent text data input stream class}
+\twocolitem{\helpref{wxTextOutputStream}{wxtextoutputstream}}{Platform-independent text data output stream class}
+\twocolitem{\helpref{wxFileInputStream}{wxfileinputstream}}{File input stream class}
+\twocolitem{\helpref{wxFileOutputStream}{wxfileoutputstream}}{File output stream class}
+\twocolitem{\helpref{wxFFileInputStream}{wxffileinputstream}}{Another file input stream class}
+\twocolitem{\helpref{wxFFileOutputStream}{wxffileoutputstream}}{Another file output stream class}
+\twocolitem{\helpref{wxZlibInputStream}{wxzlibinputstream}}{Zlib (compression) input stream class}
+\twocolitem{\helpref{wxZlibOutputStream}{wxzliboutputstream}}{Zlib (compression) output stream class}
+\twocolitem{\helpref{wxZipInputStream}{wxzipinputstream}}{Input stream for reading from ZIP archives}
+\twocolitem{\helpref{wxSocketInputStream}{wxsocketinputstream}}{Socket input stream class}
+\twocolitem{\helpref{wxSocketOutputStream}{wxsocketoutputstream}}{Socket output stream class}
+\end{twocollist}
+
+{\large {\bf Threading classes}}
+
+\overview{Multithreading overview}{wxthreadoverview}
+
+wxWindows provides a set of classes to make use of the native thread
+capabilities of the various platforms.
+
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\helpref{wxThread}{wxthread}}{Thread class}
+\twocolitem{\helpref{wxMutex}{wxmutex}}{Mutex class}
+\twocolitem{\helpref{wxMutexLocker}{wxmutexlocker}}{Mutex locker utility class}
+\twocolitem{\helpref{wxCriticalSection}{wxcriticalsection}}{Critical section class}
+\twocolitem{\helpref{wxCriticalSectionLocker}{wxcriticalsectionlocker}}{ritical section locker utility class}
+\twocolitem{\helpref{wxCondition}{wxcondition}}{Condition class}
+\end{twocollist}
+
+{\large {\bf HTML classes}}
+
+wxWindows provides a set of classes to display text in HTML format. These
+class include a help system based on the HTML widget.
+
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\helpref{wxHtmlHelpController}{wxhtmlhelpcontroller}}{HTML help controller class}
+\twocolitem{\helpref{wxHtmlWindow}{wxhtmlwindow}}{HTML window class}
+\twocolitem{\helpref{wxHtmlEasyPrinting}{wxhtmleasyprinting}}{Simple class for printing HTML}
+\twocolitem{\helpref{wxHtmlPrintout}{wxhtmlprintout}}{Generic HTML wxPrintout class}
+\twocolitem{\helpref{wxHtmlParser}{wxhtmlparser}}{Generic HTML parser class}
+\twocolitem{\helpref{wxHtmlTagHandler}{wxhtmltaghandler}}{HTML tag handler, pluginable into wxHtmlParser}
+\twocolitem{\helpref{wxHtmlWinParser}{wxhtmlwinparser}}{HTML parser class for wxHtmlWindow}
+\twocolitem{\helpref{wxHtmlWinTagHandler}{wxhtmlwintaghandler}}{HTML tag handler, pluginable into wxHtmlWinParser}
+\end{twocollist}
+
+{\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.
+
+\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}