Are they?

From MSDN
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlr
fSystemDelegateClassTopic.asp

"The invocation list of a delegate is an ordered set of delegates in which
each element of the list invokes exactly one of the methods invoked by the
delegate. An invocation list can contain duplicate methods. During an
invocation, a delegate invokes methods in the order in which they appear in
the invocation list. A delegate attempts to invoke every method in its
invocation list; duplicates are invoked once for each time they appear in
the invocation list. Delegates are immutable; once created, the invocation
list of a delegate does not change."

Etienne Boucher