B<-V> command-line switch documented in L<perlrun>.
In Windows platforms, $^O is not very helpful: since it is always
-C<MSWin32>, it doesn't tell the difference between 95/98/ME/NT/2000/XP/CE.
-Use Win32::GetOSVersion() (see L<perlport>) and other means (like for
-example the presence/absence of some files) to distinguish between
-the variants.
+C<MSWin32>, it doesn't tell the difference between
+95/98/ME/NT/2000/XP/CE/.NET. Use Win32::GetOSName() or
+Win32::GetOSVersion() (see L<Win32> and L<perlport>) to distinguish
+between the variants.
=item ${^OPEN}
An internal variable used by PerlIO. A string in two parts, separated
-by a C<\0> byte, the first part is the input disciplines, the second
-part is the output disciplines.
+by a C<\0> byte, the first part describes the input layers, the second
+part describes the output layers.
=item $PERLDB