void observe ( nsISupports subject , char* topic , PRUnichar* data )

Observe will be called when there is a notification for the topic topic. This assumes that the object implementing this interface has been registered with an observer service such as the nsIObserverService.

If you expect multiple topics/subjects, the impl is responsible for filtering.

You should not modify, add, remove, or enumerate notifications in the implemention of observe.

Arguments:

subject: : Notification specific interface pointer.

topic: : The notification topic or subject.

data: : Notification specific wide string. subject event.