Ninety percent of today's enterprise networks are heterogeneous: many of these consist of Windows NT subsystems that have been built into legacy IBM mainframe environments. Setting up Windows NT not only to coexist, but to function optimally, in these environments presents unique challenges. Network architects and administrators require an explanation of the subject matter using terms and analogies that are familiar and based upon an understanding of their current working background. Additionally, with the approach of Windows 2000, the newest version of NT, manufacturers such as Hitachi, Amdahl, Compaq, and Digital have announced their intention to build mainframe class machines that will run Windows NT. Microsoft has responded by encouraging the development of tools to insure that Windows NT runs effectively on large-scale hardware; Windows 2000 will include such features. Thus the demand for system integration know-how is growing.