[AUCTeX] Problem with TeX-command-region

[M. Damerell]

It works but if the region contains refs to labels
that are outside the region, these are unresolved.
I assume that this is because Latex reads

region.aux  instead of  master.aux

Also if the start of region comes in page 37 of the
master file, then region.dvi still starts at
page 1.

Please any advice?

Minor problem: The info file  auctex > node Mathematics
refers to the auctex ref. card. Please, where is it?

Thank you.