Just to elaborate on the above...

Programs such as Max, Maya, and Softimage allow you to create parametric geometry and then go on to further edit and manipulate the geometry in various ways, storing every operation in a history, or as Max calls it, a modifier stack.
And as long as you don't delete that history (which you should do from time to time after being satisfied with your object, to save memory and speed up future operations), it will always be there and you can edit the basic parameters of every operation minutes, hours, days...weeks after creating it.
But once it's exported to another format, that history is gone. Your Maya  object has to forever be a Maya file, for example, and you also lose all the history if you export it as a different 3D file and re-import it.

So if that's the case with this parametric geometry in Poser, it's great for Poser, but couldn't be used elsewhere. While the geometry itself can be used elsewhere, everything that makes it "parametric" is lost.