Virtual Memory System : VMS 

OpenVMS also supports clustering (called VAXcluster or later VMScluster), where multiple systems share processing, job queues, print queues, and disk storage, either over a special computer interconnect (CI) bus or over Ethernet (called a LAVC, for local area network VMS cluster).

OpenVMS can be divided into three layers

• the kernel, made up of input/output, memory management, and process/time management subsystems
• core services, made up of DCL, RMS, DECwindows, and the RTLs
• utility programs for support, system management, and programming

DCL - Digital Command Language - command line interface
DECwindows - Digital's implementation of the X Window System
RMS - Record Management Services - high-level, language/device-independent IO
RTL - Runtime Libraries - shared routines and functions, callable from any language
FDL - File Description Language - defines file record/field structure

OpenVMS was originally designed Dave Cutler, who had earler developed Digital's RSX-11 operating systems. Cutler was hired in 1988 by Microsoft to build the team that developed Windows NT. The original name of the operating system was VMS, but it was renamed OpenVMS in the 1990s in a bid by Digital to position the product as an alternative to Unix.

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