how do i run a shell command without waiting for the output

gabrielsousa has asked for the wisdom of the Perl Monks concerning the following question:

how do i run a shell command without waiting for the output.
is this rigth ?

 
my $pid;
if (defined ($pid=fork))
   {
   if (!$pid)
      {
#system qq(curl -H "Content-Type: application/json" -X POST -d '$datac
+url' http://192.168.125.169/index.php/itsqd/v1/nmessage);
exec qq(curl -H "Content-Type: application/json" -X POST -d '$datacurl
+' http://192.168.125.169/index.php/itsqd/v1/nmessage);

      }
   }
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