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    <p>Looking through the nowjs source code, I believe they do this by continuously monitoring the <code>now</code> object and pushing changes between client and server whenever they are detected. I admit I haven't fully grokked their code yet, however.</p> <p>In a browser, this would be done with some fun <code>setInterval</code> hacks.</p> <p><strong>EDIT</strong>: yes, that is indeed what they do: <a href="https://github.com/Flotype/now/blob/master/lib/client/now.js#L368">line 368</a> of the client <code>now.js</code>. They do <a href="https://github.com/Flotype/now/blob/master/lib/client/now.js#L164">some more tricks</a> so that once a new property is detected, future access to it is caught by getters and setters, but those modifications are only made every 1000 ms in a <code>setTimeout</code>.</p> <p>Another piece of evidence that this is impossible in current JavaScript is that <a href="http://wiki.ecmascript.org/doku.php?id=harmony:proxies">the proxies proposal for ECMAScript Harmony</a> is designed explicitly to enable such scenarios, implying very strongly that they can't be done currently. Recent Mozilla browsers have <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Proxy">a prototype proxies implementation</a>, if perhaps that's enough. And apparently <a href="http://code.google.com/p/v8/issues/detail?id=1543">V8 is working to add support</a>, which could be enough depending on what version of V8 Node is using these days.</p> <p><strong>EDIT2</strong>: oh cool, on the <em>server</em> side apparently nowjs does use proxies! Which likely means they are mature enough in Node for your usage. See what they do at <a href="https://github.com/Flotype/now/blob/master/lib/proxy.js">https://github.com/Flotype/now/blob/master/lib/proxy.js</a>. Or just do <code>var Proxy = require("nodejs-proxy")</code> and hope they follow the spec so you can take advantage of the documentation from MDC and elsewhere.</p>
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    1. COAlright... I can understand client-side hacks, especially b/c of browser compatibility issues. What about server-side? Like, on Node.JS? Do you think it's possible to do something there?
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    2. COI actually just edited my post with my findings there as you were commenting :)
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