I've seen various things for interacting with org mode from external apps.
I found org-protocol, as well as a Mutt-to-org mode article. Per the
tittle, I want to be able to add new TODO items from, say, an email or a
PHP-based web page form. Is this just brute force external file
manipulation, i.e., e.g., my PHP code would simply open a .org file and
concatenate a properly formatted TODO line . . . or are there more
sophisticated ways of talking to emacs/org-mode from without?

LB