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Reference / Glossary

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Cross References
RACF ("rack-eff") See Resource Access Control Facility.
radio button n. A circle with text beside it. Radio buttons are combined to show a user a fixed set of choices from which the user can select one. The circle becomes partially filled when a choice is selected.
RAM See random access memory.
ramp v. To increase (as in: "We're ramping up production of that box.").
random access adj. Pertaining to a computer's process of reading data from and writing data to storage in a nonsequential manner.
random access memory (RAM) n. A temporary storage location in which the central processing unit (CPU) stores and executes its processes.
RAS n. Reliability, availability, and serviceability.
rated throughput n. For data links, the rate at which all of the offered frames are forwarded by the device.
reachability n. The ability of a node or a resource to communicate with another node or resource.
README.file n. A file that should be viewed before the program associated with it is installed or executed. A README file typically contains last-minute product information, installation information, or tips on using the product.
read-only adj. Pertaining to data that can be read but cannot be modified.
read-only memory (ROM) n. Memory in which stored data cannot be modified by the user except under special conditions.
real time [1] 1. adj. In Open Systems Interconnection architecture, pertaining to the processing of data by a computer in connection with another process outside the computer according to time requirements imposed by the outside process. This term is also used to describe systems operating in conversational mode and processes that can be influenced by human intervention while they are in progress.
real time [2] 2. adj. In Open Systems Interconnection architecture, pertaining to an application such as a process control system or a computer-assisted instruction system in which response to input is fast enough to affect subsequent input. 3. adj. Now, currently, without delay (as in: "The program provides real time results.").
RealAudio system n. A client/server-based media delivery system developed by Progressive Networks. The RealAudio system supports live and on-demand audio over the Internet and can be used by news, entertainment, sports, and business organizations to create and deliver multimedia over the Internet.
realm n. In the WebSphere family of products, a database of users, groups, and access control lists. A user must be defined in a realm to access any resource belonging to that realm.
reassembly n. In communications, the process of putting segmented packets back together after they have been received.
recognition event n. A gathering to which employees may be invited as a reward for their achievements. Many recognition events are held off-site (see).
reduced instruction-set computer (RISC) n. A computer that uses a small, simplified set of frequently used instructions for rapid execution.
register n. A part of internal storage having a specified storage capacity and usually intended for a specific purpose.
registry n. In a Microsoft Windows operating system, a database that contains system configuration information regarding the user, the hardware, and the programs and applications that are installed. Windows operating systems reference the registry during operation.
relational database n. A database in which the data are organized and accessed according to relations.
release 1. n. A distribution of a new product or new function and APAR fixes for an existing product. Normally, programming support for the prior release is discontinued after some specified period of time following availability of a new release. The first version of a product is announced as Release 1, Modification Level 0. 2. v. In VTAM, to relinquish control of resources (communication controllers or physical units).
remote 1. adj. Pertaining to a system, program, or device that is accessed through a telecommunication line. 2. adj. Pertaining to computing that is performed at a location that is distant from a central site (such as the office location), usually over a network connection. The remote computing device may be stationary and nonportable, or it may be portable.
remote host n. Any host on a network except the host at which a particular operator is working.
reset 1. v. To cause a counter to take the state corresponding to a specified initial number. 2. v. To put all or part of a data processing device back into a prescribed state. 3. n. On a virtual circuit, reinitialization of data flow control. At reset, all data in transit are eliminated.
resident adj. Pertaining to computer programs or data while they remain on a particular storage device.
Resource Access Control Facility (RACF) n. An IBM licensed program that provides access control by identifying users to the system; verifying users of the system; authorizing access to protected resources; logging detected, unauthorized attempts to enter the system; and logging detected accesses to protected resources. RACF is included in OS/390 Security Server and is also available as a separate program for the MVS and VM environments.
response time 1. n. The elapsed time between the end of an inquiry or demand on a computer system and the beginning of the response; for example, the length of time between an indication of the end of an inquiry and the display of the first character of the response at a user terminal. 2. n. For response time monitoring, the time from the activation of a transaction until a response is received, according to the response time definition coded in the performance class.
RFA ("ar-ef-ay") n. Request For Announcement. The primary, formal, document that is at the core of the announcement process and product release (as in: "We're looking at an RFA in the third quarter.").
RGB 1. n. Color coding in which the brightness of the additive primary colors of light, red, green, and blue, are specified as three distinct values of white light. 2. adj. Pertaining to a color display that accepts signals representing red, green, and blue.
ring network 1. n. A network in which every node has exactly two branches connected to it and in which there are exactly two paths between any two nodes. 2. n. A network configuration in which devices are connected by unidirectional transmission links to form a closed path.
road show n. The delivery of presentations, product demonstrations and similar materials to customers and others in a series of venues outside of headquarters.
roll out 1. v. To deliver or announce a product or series of products or to make a series of announcements on a given issue or topic. 2. n. The event or events at which such an announcement is made.
ROM See read-only memory.
root directory n. The highest level directory in a hierarchical file system.
router [1] 1. n. A computer that determines the path of network traffic flow. The path selection is made from several paths based on information obtained from specific protocols, algorithms that attempt to identify the shortest or best path, and other criteria such as metrics or protocol-specific destination addresses.
router [2] 2. n. An attaching device that connects two LAN segments, which use similar or different architectures, at the reference model network layer. 3. n. In OSI terminology, a function that determines a path by which an entity can be reached.
routine n. A program, or part of a program, that may have some general or frequent use.
RS/6000 n. A family of workstations and servers based on IBM's POWER architecture. They are primarily designed for running multiuser numerical computing applications that use the AIX operating system.
run time n. The time period during which a computer program is executing. A run-time environment is an execution environment.
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