Is there a session id assigned by Shiny Server to each browser session? How do I access the info about a Shiny app?

We track some information related to the user/session id. To see a little discussion about the session object, look here: http://shiny.rstudio.com/articles/client-data.html. Google Analytics may also be useful for tracking unique sessions as discussed here: https://groups.google.com/forum/#!searchin/shiny-discuss/%22session$20id%22/shiny-discuss/GZyynqw9Zbw/dmZPYdXkYWQJ and here: http://blog.rstudio.org/2014/09/08/track-how-visitors-use-your-shiny-app-with-google-analytics/