I do not understand processing on gamdom website

#1

I want to know how it works so that everyone can see the random value simultaneously.
It works on server or client ? And how to write it? Now i do it on Template.name.onRendered it will only work when i enter. Not real time .

this link : https://gamdom.com/crash

Template.randomX.onRendered(function() {
  var Seconds = new Date().getTime() + 5000;
  var x = (Math.random() * 10).toFixed(2);
  Session.set('value', x)

  $('#random').countdown(Seconds, function(event) {
    $(this).html(event.strftime('Next round in %Ss'));
  }).on('finish.countdown', function() {
    $(this).html('Busted <br>@ <b>' + x + 'x</b>');;
    var MD5 = new Hashes.MD5;
    Games.insert({
      x,
      createdAt: new Date(),
      owner: Meteor.userId(),
      at: '-',
      bet: '-',
      bonus: '-',
      profit: '-',
      hash: MD5.hex(x),
    });
  });
});

Sorry, I’m not good at English