How to use the cote.Publisher function in cote

var cote = require('cote'),
    models = require('../models');

var purchaseResponder = new cote.Responder({
    name: 'purchase responder',
    namespace: 'purchase',
    respondsTo: ['buy']
});

var purchasePublisher = new cote.Publisher({
    name: 'purchase publisher',
    namespace: 'purchase',
    broadcasts: ['update']
});

var paymentRequester = new cote.Requester({
    name: 'payment requester',
    key: 'payment'
});

purchaseResponder.on('*', console.log);

purchaseResponder.on('buy', function(req, cb) {
    var purchase = new models.Purchase({});

    models.Product.get(req.productId, function(err, product) {

var cote = require('cote'),
    models = require('../models');

var productResponder = new cote.Responder({
    name: 'product responder',
    namespace: 'product',
    respondsTo: ['list']
});

var productPublisher = new cote.Publisher({
    name: 'product publisher',
    namespace: 'product',
    broadcasts: ['update']
});

productResponder.on('*', console.log);

productResponder.on('list', function(req, cb) {
    var query = req.query || {};
    models.Product.find(query, cb);
});

productResponder.on('create', function(req, cb) {
    models.Product.create(req.product, function(err, products) {
        cb(err, products);

var cote = require('cote'),
    models = require('../models');

var userResponder = new cote.Responder({
    name: 'user responder',
    namespace: 'user',
    respondsTo: ['create']
});

var userPublisher = new cote.Publisher({
    name: 'user publisher',
    namespace: 'user',
    broadcasts: ['update']
});

userResponder.on('*', console.log);

userResponder.on('create', function(req, cb) {
    models.User.create({}, cb);

    updateUsers();
});

userResponder.on('list', function(req, cb) {
    var query = req.query || {};
    models.User.find(query, cb);