I have my LiveAgent buttons set to Least Active.  We don't have a large chat volume and I want to know what routing logic occurs if none of my Reps are in an active chat.  Who get the next incoming chat?

I need to get a list of all users who are currently logged into my org.

This idea (https://success.salesforce.com/ideaView?id=08730000000BpPOAA0) explains that, as of a few months ago, this is possible. It explains where to find this information via the browser (Setup | Security Controls | Session Management), and also says that it's available through the API. Can anyone point me to documentation that explains how to get it via the API?

Thanks!