Turokhan Legion

Hi Guys, This ones been baffling me for weeks now and was wondering if anyone could shed some light. I am writing a script to teleport to an avatar or at a basic level, report the agents in the region. llSensor has a maximum range of 96m but i have seen devices that can display agent names at any position, i.e. if i am at 3500m, i can see my friend at 21m. Thanks in advance :)