It?s a delegate that points to and eventually fires off 
several methods.

Multicast delegate is a delegate which stores the address of
multiple mothods and also used for event handling

multicasting is that you can combine several handler 
methods in a list so they are all bound to a single 
delegate object. When Invoke is called on the delegate 
object, the MulticastDelegate class provides the code to 
execute every handler method in the list.