The default wrapper that Flex Builder creates includes deep linking and support for Express Install. The BrowserManager lets users navigate through a Flex application using the web browser's Back and Forward buttons. Express Install detects if the client has the required version of Flash Player to run the application and installs a newer player on the client if necessary.

Each of these features requires additional files to be deployed with your application, as described here. For additional information on implementing these features, see Deep Linking and Using Express Install.

Before adding additional functionality to your custom wrapper, you should understand the issues described in Customizing the wrapper.

A simple application uses only the main wrapper plus a JavaScript file that embeds the Flex application's SWF file.