appropriate class is aliased to the name wxHelpController for each platform, as follows:
\begin{itemize}\itemsep=0pt
-\item On Windows, wxWinHelpController is used.
+\item On desktop Windows, wxCHMHelpController is used (MS HTML Help).
+\item On Windows CE, wxWinceHelpController is used.
\item On all other platforms, wxHtmlHelpController is used if wxHTML is
compiled into wxWidgets; otherwise wxExtHelpController is used (for invoking an external
browser).