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Direct memory access (DMA) is a feature of computer systems that allows certain hardware subsystems to access main system memory independent of the central processing unit (CPU).
The National Geospatial-Intelligence Agency (NGA) is a combat support agency under the United States Department of Defense and a member of the United States Intelligence Community, with the primary mission of collecting, analyzing, and distributing geospatial intelligence (GEOINT) in support of national security. NGA was known as the National Imagery and Mapping Agency (NIMA) until 2003.
In computer science, multiple buffering is the use of more than one buffer to hold a block of data, so that a "reader" will see a complete version of the data, rather than a partially updated version of the data being created by a "writer". It is also used to avoid the need to use dual-ported RAM (DPRAM) when the readers and writers are different devices.
In IBM PC compatible computing, DOS memory management refers to software and techniques employed to give applications access to more than 640 kibibytes (kiB) of "conventional memory". The 640 KiB limit was specific to the IBM PC and close compatibles; other machines running MS-DOS had different limits, for example the Apricot PC could have up to 768 KiB and the Sirius Victor 9000, 896 KiB. Memory management on the IBM family was made complex by the need to maintain backward compatibility to the original PC design and real-mode DOS, while allowing computer users to take advantage of large amounts of low-cost memory and new generations of processors. Since DOS has given way to Microsoft Windows and other 32-bit operating systems not restricted by the original arbitrary 640 KiB limit of the IBM PC, managing the memory of a personal computer no longer requires the user to manually manipulate internal settings and parameters of the system.
A virtual private server (VPS) is a virtual machine sold as a service by an Internet hosting service. The virtual dedicated server (VDS) also has a similar meaning.
In computing, the term virtual directory has a couple of meanings. It may simply designate a folder which appears in a path but which is not actually a subfolder of the preceding folder in the path. However, this article will discuss the term in the context of directory services and identity management.
VDS is a three-letter abbreviation which may mean:
In computer science, asynchronous I/O is a form of input/output processing that permits other processing to continue before the transmission has finished.
KLST, virtual channel 8, is a CBS-affiliated television station licensed to San Angelo, Texas, United States. The station is owned by Nexstar Media Group, which also operates NBC affiliate KSAN-TV under joint sales and shared services agreements (JSA/SSA) with owner Mission Broadcasting. The two stations share studios on Armstrong Street in San Angelo; KLST's transmitter is located near Eola, Texas.
KTXS-TV, virtual channel 12, is an ABC affiliated television station serving Abilene, Texas, United States that is licensed to Sweetwater. Owned by the Sinclair Broadcast Group, it is a sister station to low-powered MeTV affiliate KTES-LD, channel 40. The two stations share studios on North Clack Street in Abilene and transmitter facilities near Trent, Texas.
A virtual appliance is a pre-configured virtual machine image, ready to run on a hypervisor; virtual appliances are a subset of the broader class of software appliances. Installation of a software appliance on a virtual machine and packaging that into an image creates a virtual appliance. Like software appliances, virtual appliances are intended to eliminate the installation, configuration and maintenance costs associated with running complex stacks of software.
In computing, an input–output memory management unit (IOMMU) is a memory management unit (MMU) that connects a direct-memory-access–capable (DMA-capable) I/O bus to the main memory. Like a traditional MMU, which translates CPU-visible virtual addresses to physical addresses, the IOMMU maps device-visible virtual addresses to physical addresses. Some units also provide memory protection from faulty or malicious devices.
Desktop virtualization is a software technology that separates the desktop environment and associated application software from the physical client device that is used to access it.
Village design statement (VDS) is a term of English rural planning practice. A VDS is a document that describes the distinctive characteristics of the locality, and provides design guidance to influence future development and improve the physical qualities of the area. Due to the rural bias of many communities and the large urban majority in the UK its often considered in the context of urban planning although it was developed for the rural setting.
In computing, virtualization refers to the act of creating a virtual version of something, including virtual computer hardware platforms, storage devices, and computer network resources.
Cloud computing is the on-demand availability of computer system resources, especially data storage and computing power, without direct active management by the user. The term is generally used to describe data centers available to many users over the Internet. Large clouds, predominant today, often have functions distributed over multiple locations from central servers. If the connection to the user is relatively close, it may be designated an edge server.
Radiant Logic, Inc. is an American computer software corporation focusing on solutions for Identity Integration, Enterprise Information Integration, Information Security, and Data Management. The company pioneered the development of the virtual directory (VDS) in complex enterprise Identity Management deployments, which they then evolved into a more comprehensive and scalable federated identity and directory service.
A DMA attack is a type of side channel attack in computer security, in which an attacker can penetrate a computer or other device, by exploiting the presence of high-speed expansion ports that permit direct memory access (DMA).
In computer networking, a wildcard certificate is a public key certificate which can be used with multiple sub-domains of a domain. The principal use is for securing web sites with HTTPS, but there are also applications in many other fields. Compared with conventional certificates, a wildcard certificate can be cheaper and more convenient than a certificate for each sub-domain. Multi-domain wildcard certificates further simplify the complexity and reduce costs by securing multiple domain and their sub-domains.
References
- Complete Text PW0519: Virtual DMA Services (VDS), Support., Microsoft 1992
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