Custom Event Notification Plug-ins
You can use event notification plug-ins to handle server and client event notices. Windows Media Services includes two script-based event notification plug-ins, the WMS Active Script Event Handler plug-in and the WMS WMI Event Handler plug-in. If these do not fit your needs, you can create your own. For more information, see Creating Event Notification Plug-ins and Event Notification Plug-in Sample.