I put up a small wifi hotspot area. I have an existing 500 meter radius wifi coverage. When I monitor my user using the console in my sector antena, I can see their MAC address when they are connected to my wifi signal, yet some of them are only connected to the portal where they need to enter a wifi PIN code. Seeing alot of my users in this situation, I feel the need to send then a small message to pop up in their desktop instructing them to buy a wifi PIN code in order to get through the portal and surf the net.