title: Is there any way to make R Shiny support multiple users? I'm talking about hundreds of concurrent users
body: <p>Is there any way to make R Shiny support multiple users? I'm talking about hundreds of concurrent users.
  To add some context: I'm not talking about Authentication (username / password). That will be taken care of by Auth0 (see auth0.com). So AFTER they are logged in, I see that Shiny Server does not pass the username to the Shiny session (maybe deliberately, so that you are forced to purchase the Commercial license to Shiny Server?).My question is more about : a) how do I make it recognize the username of the logged in user? b) will it scale to hundreds of concurrent (simultaneous) users?</p>