=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 setpgrp(2).  If the arguments are omitted, it defaults to
C<0,0>.  Note that the POSIX version of C<setpgrp()> does not accept any
arguments, so only setpgrp C<0,0> is portable.

=back