How to send a variable from server to client in meteor?

I have a page with text input and a button. When I insert link to youtube video into text field and press the button - video downloads into the local folder.

The problem: how can I send link to local copy of the downloaded video back to the client?

More general question: How can I send a variable from server to client (this variable is temporary and is not going to be stored anywhere) ?

The code I have right now:

Client code

if (Meteor.isClient) {
    Path = new Meteor.Collection("path");
    Meteor.subscribe("path");

    Template.hello.events(
        {
            'submit .form' : function() {
                var link = document.getElementById("youtube-url").value;
                Meteor.call('download', link);
                event.preventDefault();
            }
        }
    );
}

Server code ('collection' part is not working)

if (Meteor.isServer) {
    Meteor.startup(function () {

        Meteor.methods({
            download: function (link) {
                var youtubedl = Npm.require('youtube-dl');
                var Fiber = Npm.require("fibers");
                var dl = youtubedl.download(link, './videos');

                // called when youtube-dl finishes
                dl.on('end', function(data) {
                  console.log('\nDownload finished!');
                  Fiber(function() { 
                      Path = new Meteor.Collection("path");
                      Path.insert({path: './videos/' + data.filename});
                  })
                });              
            }
        });
    });
}

Thanks!