TargetStateCallback<T> : MulticastDelegate, ICloneable, ISerializable
      (ctor) TargetStateCallback<T>( object object, IntPtr method )
      virtual IAsyncResult BeginInvoke( Mobile from, object targeted, T state, AsyncCallback callback, object object )
      virtual void EndInvoke( IAsyncResult result )
      virtual void Invoke( Mobile from, object targeted, T state )