What is CMS?

The Conversational Monitor System (CMS), although a component of the VM/ESA operating system, is itself an operating environment Users communicate with CMS through commands, and CMS uses system messages to communicate to users.

CMS can help you perform a wide variety of tasks. For example, you can:

Do office work with the help of licensed programs designed to run on CMS, such as OfficeVision/VM and the Document Composition Facility (DCF) with BookMaster*
Do numerically-intensive computing with the help of supported language libraries and compilers, such as VS FORTRAN
Create and edit files
Write, test, and debug application programs for use under either CMS or guest systems
Process application programs developed under either CMS or guest systems
Share data between CMS and guest systems
Communicate with other users

CMS contains many application programming facilities, including:

Extended architecture support
CMS application programming interface
OS/MVS simulation
DOS/VSE support
Callable services library (CSL)
Support for programming languages and application environments.

---from "VM/ESA Introduction and Feature Summary"

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