Python/CGI on IIS - find user ID
When using Windows authentication on IIS, the server variables should contain the username in two variables: AUTH_USER and REMOTE_USER 
CGI offers access to all server variables, check your Python docs on how to access them.
I have a very basic CGI based front end hosted on an IIS server. 
I'm trying to find the users within my shop that have accessed this site. 
All users on the network sign on with their LAN (Windows) credentials and the same session would be used to access the site.
The python getpass module (obviously) returns only the server name so is there a way to find the user names of the visitors to the site?
The stack is Python 2.7 on IIS 8.0, Windows Server 2012