Are you asking for a prop to supply light in Poser 8 or Poser 7? It was never officially supported in P7 and was horribly slow, even worse than P8 was on its initial release. Now, P8 has pretty fast GI, allowing props to be used as light sources. To be clear, in P8 when IDL enabled, all props are light sources, just not necessarily light originators. The fact is that there's not much difference between a wall that is white because a light is shining on it, versus a wall that is white because its shader says it is white no matter what. The part people talk about, the "ambient" part of the shader, is just the simplest possible mathematical formula for the illumination coming off an object - it defines it as a constant. The normal lighting, what we think of as not self-lit, is not a constant and depends on something else illuminating it. But once you enable IDL, then it isn't that important as to why a prop is providing light to other props.  The Ambient channel is one way, but it is just as "self-lit" if you plug a SimpleColor node into Alternate_Diffuse or Alternate_Specular or Reflection_Color ... etc.

I find it strange that I've had to explain the same thing 3 times in one week. Do you guys ever read other threads? LOL.

The job of a shader is to say what color something is. It usually does that by examining light sources and applying some math, but it can just as easily define the math as BLUE - and the color is BLUE - end of discussion. Lights are not necessary to define what color an object appears to be. However, when a shader does invoke rules about light sources before deciding to be any color other than black, then it can use only the "lights" or it can also use all the other shaders in the scene. That's the difference between GI and not GI.

The Gather node is a limited ability to treat nearby props as a light source, but only for a specific material on which the Gather is placed. It's not very useful, it looks bad, computes really slowly, and is completely lame and inexcusable compared to IDL.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)