In open systems, a virtual terminal (VT) is an application service that: Open systems are computer systems that provide either interoperability, portability, or freedom from proprietary standards, depending on your perspective. ...

1. Allows host terminals on a multi-user network to interact with other hosts regardless of terminal type and characteristics,
2. Allows remote log-on by local area network managers for the purpose of management,
3. Allows users to access information from another host processor for transaction processing,
4. Serves as a backup facility.

Source: from Federal Standard 1037C A wide variety of systems of interconnected components are called networks. ... A computer terminal is an electronic or electromechanical hardware device. ... Look up Access in Wiktionary, the free dictionary This is a list of articles related to the notion of access: information transfer, computer storage, telecommunication and computer networks: ACCESS.bus access charge access method access time broadband Internet access broadband wireless access code division multiple access Common User Access dial... Information is a term with many meanings depending on context, but is as a rule closely related to such concepts as meaning, knowledge, instruction, communication, representation, and mental stimulus. ... A CPU The exact term processor is a sub-system of a data processing system which processes received information after it has been encoded into data by the input sub-system. ... In telecommunication, the term facility has the following meanings: 1. ... Federal Standard 1037C entitled Telecommunications: Glossary of Telecommunication Terms is a U.S. Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. ...

ITU-T defines a virtual terminal protocol (VT) based on the OSI application layer protocols, which is not widely used on the Internet. The ITU Telecommunication Standardization Sector (ITU-T) coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU). ... Starting in 1982, the International Organization for Standardization (ISO) along with the ITU-T initiated a new effort in networking called Open Systems Interconnect or OSI. Prior to OSI, networking was completely vendor-developed and proprietary, with standards such as SNA, Decnet, and XNS. OSI was a new industry effort... The application layer is the seventh (7) level of the seven-layer OSI model. ...