David Soulayrol wrote:
> Hello,
> 
> I'm looking for a way to obtain asynchronous notifications
> of emacs actions, like: buffer was closed, displayed buffer has changed,
> and so on.

Emacs has hooks for many actions.  For example, kill-buffer-hook is run
when a buffer is closed.  Run C-h f on kill-buffer-hook and add-hook,
and C-h v on after-change-functions.  See also
http://www.delorie.com/gnu/docs/elisp-manual-21/elisp_540.html and
http://www.gnu.org/software/emacs/manual/html_node/Hooks.html .

Remember, emacs can do anything if you ask nicely enough.  Theoretical
limitations do not exist as with other programs. ;)

Matthew Flaschen