Thank you so much bagginsbill for the information!

I always used to create reflection maps for my content products in Poser. A chrome-ish looking image attached to a sphere map on the reflection node. It looks ok if you want the object to give the impression of being made of chrome or metal. This has been the established way to create chrome or metal reflections in both Poser and DAZ Studio since neither of them had any support for HDR until just recently. Ok, Poser have had support for HDR images for a couple of versions now. But since DAZ Studio didn't support HDR it felt ok to stick to "fake" reflection maps so your products would look pretty much the same in both applications.

But ever since DAZ Studio started using the Iray render engine, which has full HDR support (both lights and background reflections) I felt it was time to go over to actual reflection settings for my products for both Poser and DAZ Studio. At least include a set of materials with true reflection settings for both applications. What I find surprising is that Poser doesn't support reflections from HDR backgrounds the way I imagined it. Because most other applications (DAZ Studio, Carrara, Bryce, Cinema 4D etc) works exactly like it. Half the idea with HDR domes is to create realistic reflections in reflective materials. So if you set up a HDR background in any application above it will just work automatically with reflections just like that. It would actually be pretty difficult to achieve the Poser behaviour, having a HDR background as light source only but prevent it from being a reflection source.

I admit there's a strict logic sense with the Poser approach. In the end it gives you full control of the environment. I see how you could use one HDR image as a light source and use a complete different HDR image in a sphere for some peculiar reflection effect. But then again, you'd most often want the realistic set up with both lights and reflections coming from the same source. I find it odd that Poser doesn't have that automatically.