=item acos
This is identical to the C function C<acos()>, returning
-the arcus cosine of its numerical argument.
+the arcus cosine of its numerical argument. See also L<Math::Trig>.
=item alarm
=item asin
This is identical to the C function C<asin()>, returning
-the arcus sine of its numerical argument.
+the arcus sine of its numerical argument. See also L<Math::Trig>.
=item assert
=item atan
This is identical to the C function C<atan()>, returning the
-arcus tangent of its numerical argument.
+arcus tangent of its numerical argument. See also L<Math::Trig>.
=item atan2
This is identical to Perl's builtin C<atan2()> function, returning
the arcus tangent defined by its two numerical arguments, the I<y>
-coordinate and the I<x> coordinate.
+coordinate and the I<x> coordinate. See also L<Math::Trig>.
=item atexit
This is identical to Perl's builtin C<cos()> function, for returning
the cosine of its numerical argument, see L<perlfunc/cos>.
+See also L<Math::Trig>.
=item cosh
This is identical to the C function C<cosh()>, for returning
-the hyperbolic cosine of its numeric argument.
+the hyperbolic cosine of its numeric argument. See also L<Math::Trig>.
=item creat
=item fclose
-Use method C<IO::Handle::close()> instead.
+Use method C<IO::Handle::close()> instead, or see L<perlfunc/close>.
=item fcntl
=item fdopen
-Use method C<IO::Handle::new_from_fd()> instead.
+Use method C<IO::Handle::new_from_fd()> instead, or see L<perlfunc/open>.
=item feof
-Use method C<IO::Handle::eof()> instead.
+Use method C<IO::Handle::eof()> instead, or see L<perlfunc/eof>.
=item ferror
=item fflush
Use method C<IO::Handle::flush()> instead.
+See also L<perlvar/$OUTPUT_AUTOFLUSH>.
=item fgetc
-Use method C<IO::Handle::getc()> instead.
+Use method C<IO::Handle::getc()> instead, or see L<perlfunc/read>.
=item fgetpos
-Use method C<IO::Seekable::getpos()> instead.
+Use method C<IO::Seekable::getpos()> instead, or see L<L/seek>.
=item fgets
=item fileno
-Use method C<IO::Handle::fileno()> instead.
+Use method C<IO::Handle::fileno()> instead, or see L<perlfunc/fileno>.
=item floor
=item fopen
-Use method C<IO::File::open()> instead.
+Use method C<IO::File::open()> instead, or see L<perlfunc/open>.
=item fork
-This is identical to Perl's builtin C<fork()> function.
+This is identical to Perl's builtin C<fork()> function
+for duplicating the current process, see L<perlfunc/fork>
+and L<perlfork> if you are in Windows.
=item fpathconf
=item fseek
-Use method C<IO::Seekable::seek()> instead.
+Use method C<IO::Seekable::seek()> instead, or see L<perlfunc/seek>.
=item fsetpos
-Use method C<IO::Seekable::setpos()> instead.
+Use method C<IO::Seekable::setpos()> instead, or seek L<perlfunc/seek>.
=item fstat
=item ftell
-Use method C<IO::Seekable::tell()> instead.
+Use method C<IO::Seekable::tell()> instead, or see L<perlfunc/tell>.
=item fwrite
=item kill
This is identical to Perl's builtin C<kill()> function for sending
-signals to processes (oftern to terminate them), see L<perlfunc/kill>.
+signals to processes (often to terminate them), see L<perlfunc/kill>.
=item labs
This is identical to Perl's builtin C<sin()> function
for returning the sine of the numerical argument,
-see L<perlfunc/sin>.
+see L<perlfunc/sin>. See also L<Math::Trig>.
=item sinh
This is identical to the C function C<sinh()>
for returning the hyperbolic sine of the numerical argument.
+See also L<Math::Trig>.
=item sleep
=item tan
This is identical to the C function C<tan()>, returning the
-tangent of the numerical argument.
+tangent of the numerical argument. See also L<Math::Trig>.
=item tanh
This is identical to the C function C<tanh()>, returning the
-hyperbolic tangent of the numerical argument.
+hyperbolic tangent of the numerical argument. See also L<Math::Trig>.
=item tcdrain