A plugin is an event handler. When an event occurs, specific code within the handler is invoked.
That code can, in turn, perform the action that is required. For example, if the event is that the original manager died and the backup has taken over as manager, then the plugin might send an email notifying a system administrator that a manager died and a new backup manager must be started. A High Availability Server includes 1 or more containers, which do work such as executing queries, and 1 or more managers, which assign particular work to particular containers. As another example, the plugin may call a netsnmp process to send a "trap" signal to an event handler in another process outside the Sybase CEP manager.