Understanding Kray Indirect Rays Shader

[sat]

Hello,

is it correct that this shader is not only used in conjunction with self illuminating polygons but on surfaces that get hit by photons as well? So when I want to reduce the color bleeding on a surface, do I have to assign it to the lightsource (illuminating poly) that emits the light or to the surface that receives the light. Sorry if this has been asked before but I am a little bit confused about its correct usage. Thanks.

[jure]

You assign it to the surface that receives the light.

[sat]

Again, many thanks.