Halo in the game engine

Hi! i’m trying to create an halo effect with a spot light, like the one’s here:
http://www.geocities.com/blengine/nightshine.html
is this possible in the game engine? i hit the halo botton but nothing happens, does the halo work in the game engine? how does it work? or how could i simulate something like it if it doesn’t?

No, it doesn’t work. But you can fake it with an additive texture map.