NSPortCoder
A coder used to transmit object proxies (and sometimes objects themselves) between connections.
Declaration
@interface NSPortCoder : NSCoderOverview
NSPortCoder is a concrete subclass of NSCoder used in the distributed objects system to transmit object proxies (and sometimes objects themselves) between NSConnection objects. An NSPortCoder instance is always created and used by an NSConnection object; you should never need to explicitly create or use one directly yourself.