Amqp, RabbitMQ and NodeJS

I m actually trying to use RabbitMQ through AMQP with NodeJS to manage an online/offline message queue.

I have reproduced the tutorial code, having now :

var amqp = require('amqp');

var connection = amqp.createConnection({ host: 'http://127.0.0.1:5672/' });

// Wait for connection to become established.
connection.on('ready', function () {

    var sendMessage = function (queue, msg) {
        connection.publish(queue, JSON.stringify(msg));
    }


    connection.queue('my-queue', function (q) {
        q.bind('#');

        q.subscribe(function (message) {
            console.log(JSON.parse(message.data));
        });


        sendMessage('my-queue', 'tototototo');

    });

})

It works great. Now, I have two questions :

• Can I respond to a particulier client that sent a message ?


• How can I know if every client has got all the messages in the queue before using ack() ?

Thanks for advance