How do wireless hotspots, routers etc. go about displaying their name to devices in their range? For example, when you open your laptops network center and see named wireless connections:
DIR-xxx etc. How is this message displayed exactly from technology point, what are the processes involved?
Also, would it be somehow possible to display an image or other data besides text in the same fashion? If so, would it require altering hardware or something else?
Finally, is it possible to programmatically decrease the range of your router's signal?