Although, this is only possible due to the PRPCd together with Advancded Library or P3dO Explorer. Switching between the runtimes would be a nightmare but with these tools it is no problem.

OMFG thanks for the tip!  Advanced Library + PRPC together bring the library MUCH closer to what the Poser library should be in the first place.  How do these things escape my notice for so long?

Question, how do I make loading into Poser the default for double-clicking on an Advanced Library thumbnail?  Right now it wants Carrara and I don't know how to change this.  Also, how do I use P3DO explorer to convert all those RSRs?