Summary form only given, as follows. Over the last decade, object-oriented development methods and techniques have gained rapid acceptance in many areas, for example Graphical User Interfaces (GUI) and Network Programming. Currently there are two major standard architectures available to support Distributed Object-Oriented (OO) Programming: the Object Management Group?s Common Object Request Broker Architecture and Microsoft?s Distributed Component Object Model. While both standards address the same problems, i.e., language, hardware and operating system independence, they provide different sets of features for application developers. This tutorial provides an overview of both architectures and a comparison of program development under each. We draw some conclusions about the suitability of each architecture for different programming requirements.