they use pmd files, if I  understand question 1 correctly.  daz also requires inj/rem
files for some of their figures, but I dunno if that still applies to v4.  daz will be able to
tell ya how to do this on a mac, in case there's no OS X inj/rem util (I dunno).

laetia (caroline, erstwhile mac forum mod) wrote a tutorial or util to create mat pose files.
send her an IM.

YMMV. some will try to tell ya how rock-solid poser is on an intel mac, whilst others will
recite a litany of woes in that regard.