Mature versions of the Commodore, SWTPC, Atari and Apple home computer systems all featured a disk operating system ( actually called ' DOS ' in the case of the Commodore 64 ( CBM DOS ), Atari 800 ( Atari DOS ), and Apple II machines ( Apple DOS )), as did ( at the other end of the hardware spectrum, and much earlier ) IBM's System / 360, 370 and ( later ) 390 series of mainframes ( e. g., DOS / 360: Disk Operating System / 360 and DOS / VSE: Disk Operating System / Virtual Storage Extended ).

Multiple Virtual Storage, more commonly called MVS, was the most commonly used operating system on the System / 370 and System / 390 IBM mainframe computers.

The early commercial products were integrated with various languages: GemStone ( Smalltalk ), Gbase ( LISP ), Vbase ( COP ) and VOSS ( Virtual Object Storage System for Smalltalk ).

An example of this latter is Logic Arts ' VOSS ( Virtual Object Storage System ) available for VA Smalltalk under dual open source and commercial licensing.

z / VSE ( Virtual Storage Extended ) is an operating system for IBM mainframe computers, the latest one in the DOS / 360 lineage, which originated in 1965.

* IBM Single Virtual Storage ( SVS )-precursor of MVS which had a very short life

* VSAM – Virtual Storage Access Method

* VSAM – Virtual Storage Access Method

The ETERNUS product lineup includes Disk Storage Systems, Tape Systems, Virtual Tape Appliances, SAN Switches, and Storage Management Software.

* Four new operating systems: DOS / VS ( DOS with virtual storage ), OS / VS1 ( OS / 360 MFT with virtual storage ), OS / VS2 ( OS / 360 MVT with virtual storage ) Release 1, termed SVS ( Single Virtual Storage ), and Release 2, termed MVS ( Multiple Virtual Storage ) and planned to be available 20 months later ( at the end of March 1974 ), and VM / 370 – the re-implemented CP / CMS

Its flagship products are the Virtual Storage Platform ( for enterprise storage ), Adaptable Modular Storage for small and mid-sized companies, Hitachi Content Platform ( cloud architecture ), Hitachi Command Suite ( for storage management ), Hitachi TrueCopy ( for remote replication ), and the Hitachi NAS Platform, powered by BlueArc.

Common data source formats are relational databases and flat files, but may include non-relational database structures such as Information Management System ( IMS ) or other data structures such as Virtual Storage Access Method ( VSAM ) or Indexed Sequential Access Method ( ISAM ), or even fetching from outside sources such as through web spidering or screen-scraping.

ISAM was replaced at IBM with a methodology called VSAM ( Virtual Storage Access Method ).

Virtual storage access method ( VSAM ) an IBM disk file storage access method, first used in the OS / VS1, OS / VS2 Release 1 ( SVS ) and Release 2 ( MVS ) operating systems, later used throughout the Multiple Virtual Storage ( MVS ) architecture and now in z / OS.

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# REDIRECT Virtual Storage Access Method

Such a description language can be based on any computer programming language, such as Lisp, Pascal, or Java Virtual Machine bytecode.

Virtual manipulatives can be easily accessed on the Internet as stand-alone applets, allowing for easy access and use in a variety of educational settings.

Java applets can run in a Web browser using a Java Virtual Machine ( JVM ), or in Sun's AppletViewer, a stand-alone tool for testing applets.

Java applications are typically compiled to bytecode ( class file ) that can run on any Java Virtual Machine ( JVM ) regardless of computer architecture.

* Virtual Machine Image-cloud users can upload a machine image of their own with MySQL installed, or use a ready-made machine image with an optimized installation of MySQL on it, such as the one provided by Amazon EC2.

Virtual machines can also perform the role of an emulator, allowing software applications and operating systems written for another computer processor architecture to be run.

* Returnil Virtual System can virtualize Windows based systems, needs only a restart to rebuild the virtual machine.

Virtual reality ( VR ) is a term that applies to computer-simulated environments that can simulate physical presence in places in the real world, as well as in imaginary worlds.

Virtual reality can trace its roots to the 1860s, when 360-degree art through panoramic murals began to appear.

Virtual reality enables heritage sites to be recreated extremely accurately, so that the recreations can be published in various media.

Vassal is in turn an outgrowth of the VASL ( Virtual ASL ) project, and uses Java, making it accessible to any computer that can run a modern JVM, while the other three are Microsoft Windows programs.

Examples of configuration changes that one can do from a managed switch include: enable features such as Spanning Tree Protocol, set port bandwidth, create or modify Virtual LANs ( VLANs ), etc.

The ADB Virtual Gateway uses software that resides within the middleware and is based on open standards, including DLNA home networking and the DTCP-IP standard, to ensure that all content, including paid-for encrypted content like Pay TV services, can only be accessed by secure CE devices.

Virtual storage can refer to:

Virtual room and online file cabinets can persist for years.

Virtual reality ( VR ) is a term that applies to computer-simulated environments that can simulate physical presence in places in the real world, as well as in imaginary worlds.

Virtual teams are also becoming increasingly popular with workers who want to work at home, which can increase employee engagement.

Today, it can be viewed on the Internet as a panorama or as a QuickTime Virtual Reality ( QTVR ) panorama.

Using the Virtual Vector Architecture, several POWER5 processors can act together as one vector processor.

Virtual classrooms and meetings can often use a mix of communication technologies.

A Virtual Machine can run multiple processes.

* Virtual service desk: for organisations having multi-country locations – can be situated and accessed from anywhere in the world due to advances in network performance and telecommunications, reducing operational costs and improving usage of available resources.

Rosenberg developed one of the first known AR systems, called Virtual Fixtures, while working at the U. S. Air Force Armstrong Labs in 1991, and published first study of how an AR system can enhance human performance.

" Virtual sex "-- in which two people are able to have sex with each other through virtual reality, or in which a human can have sex with a " simulated " partner that only exists on a computer — becomes a reality.

Virtual team members can be located across a country or across the world, rarely meet face-to-face, and include members from different cultures.