EMACS - enabling at spi2 support

[Susan Cragin]

Does anyone know how to enable at-spi2 support in emacs?
My understanding is that it doesn't automatically kick in when you start EMACS, but that there is a module you can load, and that the module is included with the program or available on the debian / ubuntu packaging. 
So far I've downloaded every likely candidate and there is nothing. 
(Where are EMACS's el's kept, anyway? I can't find the folder on my hard drive.)
Thanks. I'm sort of an EMACS newbie. 
Susan Cragin