All the major 3D apps have a "headlight" feature.
Well, Softimage and Lightwave call it "headlight", while Max and Maya call it default lighting. I'm sure C4D has something similar, but I've never tried C4D.
Whatever you call it, the end result is the same - a scene which is lit so you can see what's going on to make adjustments without having to rely only on your actual scene lighting.

In LW and Softimage, turning the headlight on or off is an option. When off, you only see your scene by its own lighting, in OpenGL. With it on, you can see everything, and the headlight will not render, will not cause any lighting changes in your render.

In Max and Maya, you can switch back and forth between the default light, which is a similar, global lighting thing, and your regular scene lighting. In those apps, you can render with all lights, or your default light only.

In Poser, we've had to deal with ONLY scene lighting to see what's going on in our scenes. So if you have no lights in the back of your scene, or dim lights, and you want to see what's going on back there, you have to move an existing light or create a new light. Then, you have to remember to turn it off before rendering, assuming you don't want a light in that location.

This has been a problem for me all along - encountering situations where I need to see an area which is lit just right from the camera perspective, but not at all in an area I need to adjust and work on.

But I finally figured it out. Gee, and it only took me ten years. ;-)

Create a camera and zero out all the settings, then create a spotlight and zero it out too. The spotlight should be very close to the new camera settings, and you can look through its "shadow cam" to match your camera's view. Then you just parent it to that camera and, voila, you now have a light which will always be shining on what you're looking at through that camera. A headlight, maybe more like a mining helmet light. And by adjusting its end angle, you can make it wider, similar to lowering the focal length of your camera.

Still have to remember to turn it off before rendering though. It would be great now to have a script that automatically turns a specific light or lights off before rendering and back on afterwards. I don't know if that's possible though.