The "Live Chat" feature uses websockets in order to provide real-time chatting communication with individuals logged into system with the same Property Selection. To access the page click the link in the navigation. Once you get to the page you are presented with a chatting interface where you can see the individuals who are potentially available for chat. Note that all available people are subtly notified in the side-navigation on a new submission of a message, but to write and read message you must access the Chat Interface.
To write a message, simply write text in the form and click "Send", and also note that you are only able to delete the messages you write yourself, unless you are an admin-user.