Re: emac in large projects

[A Soare]

You must create a TAGS file first of all, in which one keeps the symbols from 
your project.

For example, to create a file TAGS of all symbols of EMACS you can use from a 
Shell

# find -name *.el -o -name *.[ch] | xargs etags

(see the documentation from find, xargs, etags)

II. From Emacs:

M-x visit-tags-table RET

<path-to-your-TAGS-file>

then M-. for the first occurence of a definition of a symbol
or

C-u 1 M-. for the next occurences, etc.

And for more see the doc from emacs info, node TAGS.