[wp-hackers] Ajax requests, admin-ajax.php and the WP_ADMIN constant

[24/7]

>  I imagine what you are doing is using is_admin() to decide whether or 
not you should include a file or attach a hook?

Yes.

>  If that is the case, you could leverage defined('DOING_AJAX'), or simply 
always attach the hook (add_action() is very cheap).

So far I couldn't (after a cross file search through core files) get around 
what the constant is for. The other problem is that I don't really 
understand what you're trying to tell me (english != mother tongue). Are 
you saying that the include !is_admin() will trigger a ajax cb fn when it 
that is hooked to wp_ajax_nopriv_* when it starts with define( 
'DOING_AJAX', true );? Also: What do you mean with the add_action and cheap 
sentence?

Thanks a lot for the exaplanation!

K.