This course introduces students to the key concepts and principles that are applicable to a variety of mainframe operating systems. Mainframe operating systems will be discussed in relationship to specific hardware architectures and applications. In the lab, user interfaces, tools and utilities, application development, and the runtime environment will be explored. The emphasis of this course is to develop an understanding of the complex relationships required in a mainframe operating system to support user processes. The impact of the use of mainframe systems in reducing power consumption in data centers will also be discussed.