VM/370—A study of multiplicity and usefulness

This introductory paper has attempted to explain the essential elements of VM/370 structure and the interfaces it provides for virtual machines. Throughout, an effort has been made to show why VM/370 is used, how it encompasses a multiplicity of uses, and where development has progressed over the years. The things that have changed most about VM/370 are how it is viewed and the uses to which it has been put within many different installations. What has changed least is its ability to be installed rapidly and become productive in many circumstances and for many purposes.