# Synopsis All [node.js's built-in modules](http://nodejs.org/api/) are available in atom-shell, and third-party node modules are fully supported too (including the [native modules](../tutorial/use-native-node-modules.md)). And atom-shell also provided some extra built-in modules for developing native desktop applications, some modules are only available on browser side, and some are only available on renderer side, and some can be used by both sides. The basic rule is: if a module is GUI or low level system related, then it should be only available on browser side. You need to be familiar with the concept of [browser side](../tutorial/quick-start.md#the-browser-side) to be able to use those modules. The browser side script is just like a normal `node.js` script: ```javascript var app = require('app'); var BrowserWindow = require('browser-window'); var window = null; app.on('ready', function() { window = new BrowserWindow({width: 800, height: 600}); window.loadUrl('https://github.com'); }); ``` And the web page is no different to a normal web page, except for the extra ability to use node modules: ```html ``` To run your app, read [Run your app](../tutorial/quick-start.md#run-your-app).