Message objects allow you to run concurrently methods on other threads or to invoke dynamically calculated messages. Methods of for this class are used, for example, to start a message on another thread, to notify the sender object when an error occurs or when message processing is complete, or to return the results of that processing to the sender or to some other object.
The class Message subclasses (specializes) The Object Class and inherits (specializes) in addition in the following order: