Help>Carbon Emacs Package>Net-Install>YaTeX
(setq auto-mode-alist (cons (cons "\\.tex$" 'yatex-mode) auto-mode-alist))
(autoload 'yatex-mode "yatex" "Yet Another LaTeX mode" t)
(add-hook 'yatex-mode-hook
'(lambda ()
(setq tex-command "platex")
(setq dvi2-command "xdvi")
))