The WAI Event Code

<?php

$event = 0;

try {
   // attempts to get an event object from the Event library
   // using the original command as defined in the WaiCommand
   $event = Event::get_event($command->get_original(), $_SESSION['instance_id']);
   // actually handles the event and returns the text to be rendered
   return $event->handle();
} catch (Exception $e) {
   // This means that there was no such event
   // continue processing as if normal
}

?>