\twocolitem{\_\_VISAGECPP\_\_}{IBM Visual Age (OS/2)}
\twocolitem{\_\_VISUALC\_\_}{Microsoft Visual C++. The value of this macro
corresponds to the compiler version: $1020$ for $4.2$ (the first supported
-version), $1100$ for $5.0$, $1200$ for $6.0$ and so on}
+version), $1100$ for $5.0$, $1200$ for $6.0$ and so on. For convenience, the
+symbols \_\_VISUALCn\_\_ are also defined for each major compiler version from
+5 to 9, i.e. you can use tests such \texttt{#ifdef \_\_VISUALC7\_\_} to test
+for compiler version being precisely 7.}
\twocolitem{\_\_XLC\_\_}{AIX compiler}
\twocolitem{\_\_WATCOMC\_\_}{Watcom C++. The value of this macro corresponds to
the compiler version, $1100$ is $11.0$ and $1200$ is OpenWatcom.}
\twocolitem{\_\_WXWINDOWS\_\_}{always defined in wxWidgets applications, see
also \helpref{wxCHECK\_VERSION}{wxcheckversion}}
\twocolitem{\_\_WXDEBUG\_\_}{defined in debug mode, undefined in release mode}
-\twocolitem{wxUSE\_XXX}{if defined as $1$, feature XXX is active
-(the symbols of this form are always defined, use \#if and not \#ifdef to test
- for them)}
+\twocolitem{wxUSE\_XXX}{if defined as $1$, feature XXX is active, see the
+\helpref{complete list}{wxusedef} (the symbols of this form are always defined,
+use \#if and not \#ifdef to test for them)}
\twocolitem{WX\_PRECOMP}{is defined if precompiled headers (PCH) are in use. In
this case, \texttt{wx/wxprec.h} includes \texttt{wx/wx.h} which, in turn,
includes a number of wxWidgets headers thus making it unnecessary to include