Here's a screenshot of the material room. What you can't see here is that I've set the minimum displacement bounds to 5 in the render settings. It probably only needs to be 2.5 to accomodate the 2.5 value you can see for displacement in the material room, but I wanted a bit of room to play so I set it to 5. You can see it's a very simple set up. The big difference between Poser and Zbrush where displacement is concerned is that Zbrush treats 50% grey as 0 displacement (black is negative displacement and white is positive) whereas Poser treats black as 0 displacement and all shades of grey are positive. To compensate for that I multiply the map by 2 and subtract 1 which means that instead of giving me displacements from 0 to 1, it gives me displacements from -1 to +1. The effect can be fairly subtle on a big model (the one shown here is 100% figure size) so to beef it up I've set the displacement in the root node to 2.5.
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