Node.js process respond to the parent process

//Get command-line arguments. Slice off "node [filename]".
var childData = process.argv.slice(2);
console.log(__filename + " childData:", childData);

global.ticker = 0;/*from   www  .ja  va  2s.  co  m*/
var data = {
  "source": __filename,
  "message": "Hello world (1)!"
}

console.log("Setting child " + __filename + "'s response interval.");
//Every 2 seconds, respond to the parent process
var interval = setInterval(function() {
  data.ticker = global.ticker;
  //Trigger a 'message' response
  process.send(data);
  global.ticker++;
  if(global.ticker > 5) {
    console.log("Clearing child " + __filename);
    clearInterval(interval);
  }
}, 750);