You can enable Google Chrome Frame to render a page by adding an HTML metatag or using an HTTP header.
For HTML metatag add to head of your web page:
<meta http-equiv="X-UA-Compatible" content="chrome=1">
For HTTP header let send your web server header:
For detect Google Chrome Frame and prompt users to install the plug-in you can use server-side sniffing or the CFInstall.js script. The big advantage is that users can install Google Chrome Frame without having administrative privileges on their machines. For more options see source code or developer documentation.
In June 2013 Google announced they would retire Chrome Frame, and will cease support and updates for the product in January 2014.