This topic is a moving target, with new devices and browsers constantly entering into the wild. The User-Agent string is how well-behaved browser programs identify to the web server on each request for web content. This info is handled by the web application and is generally logged by the web server and/or web analytics system in place. If you’re doing web development, in particular mobile web development, you might find the User Agent String.com site handy to help you adapt your web application to handle the increasing number of web-enabled smartphones and other devices such as tablets, etc. The big thing I learned today was that “Fennec” is the nickname for Firefox in the mobile arena. I’m sure you’ll find something useful as well!