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On some platforms such as Windows, where the fork() system call is not
+ available,
Perl can be built to emulate fork() in the Perl interpreter. The emula
+tion is designed to,
at the level of the Perl program, be as compatible as possible with th
+e "Unix" fork().
However it has limitation that has to be considered in code intended t
+o be portable.
See L<perlfork> for more details.

On some platforms such as Windows where the fork() system call is not 
+available.
Perl can be built to emulate fork() at the interpreter level.
This emulation has limitation related to kill that has to be considere
+d,
for code running on Windows and in code intended to be portable.
See L<perlfork> for more details.

The process which implements the pseudo-processes can be blocked and t
+he Perl interpreter
hangs.

=head1 PORTABLE PERL CODE

...
The outcome of kill on a pseudo-process is unpredictable.
It depends on the timing in the Windows operating system.
Code that has worked, suddenly can fail, resulting in errors which are
+ difficult to find.