(1) See
voicemail.
(2) (
Virtual
Machine) One instance of an operating system and applications in a virtualized environment. See
virtual machine.
(3) (
Virtual
Machine) A runtime engine for a development platform. Examples are the Java Virtual Machine and the .NET Common Language Runtime (CLR). See
runtime engine.
(4) (
Virtual
Machine) The first virtualized OS for IBM mainframes. VM runs multiple IBM operating systems of any type, each with their own applications. Originally developed by a separate research arm of the company, VM later became mainstream in the 1970s. In 2000, IBM introduced z/VM for the 64-bit z/Architecture.
VM-CP and CMS
VM-Control Program (VM-CP) is the "hypervisor" that provides the virtual machine functionality. Conversational Monitor System (CMS) is a compact guest operating system that is widely used with VM to provide interaction for one user. Each user communicates with CMS in a separate virtual machine in the computer. See
CP/CMS and
virtual machine.