These macros make it easier for you to write TeX documents with GNU Emacs. Documentation is to be found under:
/usr/doc/packages/auctex/
and in the dvi-files math-ref.dvi tex-ref.dvi (reference cards) and in info files auctex in emacs info-mode.
AuC TeX is integrated in XEmacs 19.15 and higher, therefore you may not install this packages. Note that the binary formats of the byte-compiled lisp files of the both emacs editors are incompatible, therefore you can not use this package for XEmacs.