The reason for wanting to do this are fairly obvious*, and I'm thinking (actually, hoping and praying is more like it) that perhaps there is a python script that will do this. 

I have urgent need, a huge opportunity beckons if I can get this done in a timely fashion.

*Obviously, it's convenient to break things down into manageable lengths...I wouldn't want to handle much over 300 frames in Poser.

What am I asking for? Well, it could be a new Poser scene, that's fine. It's an entire scene keyed to sit exactly where the selected frame of another scene sat.

IOW, how to copy everything in a scene, at one frame?

Somehow, I can't think of how to do this elegantly, and the messy ways I can think of to do it are just too ridiculously tedious.