You could create a local plugin which handles this type of event. In the db directory of your plugin, you'd need to add a events.php file. This file would hold the function name of the event handler, like so:
<?php
$handlers = array (
'user_enrolled' => array (
'handlerfile' => '/local/myplugin/e_handler.php',
'handlerfunction' => 'my_static_class_name::add_site_note',
'schedule' => 'instant',
'internal' => 1,
));
Following this example, you'd need to define a function 'add_site_note' in a static class 'my_static_class' which actually does something with the site notes. The handler function takes one argument: the event data object.
This is all pretty well explained in the dev docs, by the way. See: http://docs.moodle.org/dev/Events_API.
Just let us know if you run into any specific problems.
Hi Onno, I want to use message_send event for sending custom message.
I dont know much about code. Please tell me the appropriate files i need to use