Hi guys, I would like to share something I "accidentally" discover after losing a few hairs trying to use HDRI in Poser 12, I'm not sure if all nodes are available like this in P11, but I hope the workflow might be helpful to someone anyway:

I have been using the setup described by Ghostship2 (thank you for that!!!) here https://www.posersoftware.com/article/536/poser-basics-how-to-use-hdr-lighting and then I found a way to make the HDRI respond to the camera rotation, so depending on how you wanna work you don't have to manually type in the rotation (or promote it to a custom dial).

See the image, a "cycles/input/camera:view_vector" sends to "cycles/converter/vector_math", which then multiplies it by "0.0, 1.0, 0.0" (so you keep only the Y rot). In the article, this is described as "To rotate your HDRI, use the middle (Y) value to rotate its orientation. This will be important if you want to change the direction of sunlight on your figures."

Now experiment rendering two images using different camera rotations, if setup correctly the background will follow the camera.

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EVargas.Art