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    <p>Because cluster.fork is implemented on top of <a href="http://nodejs.org/docs/v0.6.5/api/all.html#child_process.fork">child_process.fork</a>, you can send messages from a master to the worker by using <code>worker.send({ msg: 'test' })</code>, and from a worker to a master by <code>process.send({ msg: 'test' });</code>. You receive the messages like so: <code>worker.on('message', callback)</code> (from worker to master) and <code>process.on('message', callback);</code> (from master to worker).</p> <p>Here's my full example, you can test it by browsing <a href="http://localhost:8000/">http://localhost:8000/</a> Then the worker will send a message to the master and the master will reply:</p> <pre><code>var cluster = require('cluster'); var http = require('http'); var numReqs = 0; var worker; if (cluster.isMaster) { // Fork workers. for (var i = 0; i &lt; 2; i++) { worker = cluster.fork(); worker.on('message', function(msg) { // we only want to intercept messages that have a chat property if (msg.chat) { console.log('Worker to master: ', msg.chat); worker.send({ chat: 'Ok worker, Master got the message! Over and out!' }); } }); } } else { process.on('message', function(msg) { // we only want to intercept messages that have a chat property if (msg.chat) { console.log('Master to worker: ', msg.chat); } }); // Worker processes have a http server. http.Server(function(req, res) { res.writeHead(200); res.end("hello world\n"); // Send message to master process process.send({ chat: 'Hey master, I got a new request!' }); }).listen(8000); } </code></pre>
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    1. COActually I want to create push server for (web/flash)socket clients. Current version stacks on 1000 simultaneous connections. So I decided to create several workers with socket.io listeners. This means I need to pass data to workers in asynchronous way.
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    2. COThat sounds ok, make sure you use Socket.IO with RedisStore.
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    3. COThis won't work. `var` inside `for`? `worker` will hold the last worker forked, not each one (specially inside the event callback). Either you don't care about all and you just enclose your callback or you hold all workers in Array.
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