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To use ri from Emacs, add the following to your startup file.
(e.g. ~/.emacs)

	(autoload 'ruby-index "ri.el" "ri utility" t)
	(autoload 'ri "ri.el" "ri utility" t)
	(autoload 'ri-show-term-at-point "ri.el" "ri utility" t)
	(autoload 'ri-show-term-composite-at-point "ri.el" "ri utility" t)

	(global-set-key "\C-c\C-c\C-r" 'ri-show-term-at-point)
	(global-set-key "\C-c\C-c\C-t" 'ri-show-term-composite-at-point)

For details, refer to the comment section of ri.el.
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