=over

=item setpgrp PID,PGRP

Sets the current process group for the specified PID, C<0> for the current
process.  Will produce a fatal error if used on a machine that doesn't
implement POSIX setpgid(2) or BSD setpgrp(2).  If the arguments are omitted,
it defaults to C<0,0>.  Note that the BSD 4.2 version of C<setpgrp> does not
accept any arguments, so only C<setpgrp(0,0)> is portable.  See also
C<POSIX::setsid()>.

=back