The WhosOn DNN Module is a module that links to the WhosOn Live Chat & Website Monitoring Application.
First, you need to have WhosOn installed on a local Windows Server (using the same server will give the best performance).
To download WhosOn installable, go to www.whoson.com/installabletrial.aspx
Follow the setup wizard for WhosOn; www.whoson.com/help/QuickStart.htm gives the quick start guide for setting up the site.
The DNN Module is located in C:\Program Files\WhosOnV4\Developer\ServerSideTracking\DNN\WhosOnDNNModule.zip
This can be added through the normal modules functions of the Host account.