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Reference / Glossary

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Cross References
ease-of-use n. The attribute of being easy to use, often more in the eyes of the designer than those of the user.
e-business n. Either (a) the transaction of business over an electronic medium such as the Internet or (b) any organization (for example, commercial, industrial, nonprofit, educational, or governmental) that transacts its business over an electronic medium such as the Internet. An e-business combines the resources of traditional information systems with the vast reach of an electronic medium such as the Internet; it connects critical business systems directly to critical business constituencies.
echo 1. n. In computer graphics, the immediate notification of the current values provided by an input device to the operator at the display console. 2. n. In word processing, to print or display each character or line as it is keyed in. 3. n. In data communication, a reflected signal on a communications channel.
e-commerce n. The subset of e-business that involves the exchange of money for goods or services purchased over an electronic medium such as the Internet.
edit n. A choice on a menu bar that provides access to other choices that enable a user to modify data.
electronic mail (e-mail) 1. (e-mail) n. Correspondence in the form of messages transmitted between user terminals over a computer network. 2. n. The generation, transmission, and display of correspondence and documents by electronic means.
e-mail See electronic mail.
emulation n. The use of a data processing system to imitate another data processing system such that the imitating system accepts the same data, executes the same programs, and achieves the same results as the imitated system.
emulation mode n. The function of a network control program that enables it to perform activities equivalent to those performed by a transmission control unit. Contrast with network control mode.
enable v. To make functional.
encryption n. In computer security, the process of transforming data into an unintelligible form in such a way that the original data either cannot be obtained or can be obtained only by using a decryption process.
end of the day n. The ultimate moment. A term not tied specifically to sunset or midnight; used by IBMers to make a sweeping generalization or conclusion (as in: "At the end of the day, this product will be a winner.").
end user n. A person at the end of the chain of hardware, systems and interfaces.
enterprise server n. A robust, powerful server with extensive capabilities and resources that can provide the necessary reliability, availability, and scalability for network computing. Other computers can connect to the enterprise server and share the facilities that it provides. Examples of enterprise servers include the IBM S/390 family of servers.
Enterprise Systems Connection n. (ESCON) A set of IBM products and services that provide a dynamically connected environment within an enterprise.
entity n. Any concrete or abstract thing of interest, including associations among things; for example, a person, object, event, or process that is of interest in the context under consideration, and about which data may be stored in a database.
entry field n. An area into which a user types or places text. Its boundaries are usually indicated
envelope 1. n. That part of a message containing information used in the submission, sending, or delivery of the message. 2. n. A storage area used to hold packets, datagrams, or fragments during TCP/IP processing.
epoch n. The time and date corresponding to 0 in an operating system's clock and time-stamp values. For most versions of the UNIX operating system, the epoch is 00:00:00 GMT, 01 January 1970. System time is measured as the number of seconds past the epoch.
error n. A discrepancy between a computed, observed, or measured value or condition and the true, specified, or theoretically correct value or condition.
error log 1. n. A data set or file in a product or system where error information is stored for later access. 2. n. A form in a maintenance library that is used to record error information about a product or system. 3. n. A record of machine checks, device errors, and volume statistical data.
error recovery procedures 1. n. Procedures designed to help isolate and, where possible, to recover from errors in equipment. The procedures are often used in conjunction with programs that record information on machine malfunctions. 2. n. A set of routines that attempt to recover from transmission errors.
escalate v. To take a disputed matter to a higher managerial authority for resolution (otherwise known as "kicking it upstairs."). Sometimes used by IBMers as a threat to force consensus between disputing parties (as in: "If we can't agree on this issue, I'll have to escalate it to ...").
Ethernet n. A 10-Mbps baseband local area network that allows multiple stations to access the transmission medium at will without prior coordination, avoids contention by using carrier sense and deference, and resolves contention by using collision detection and delayed retransmission. Ethernet uses carrier sense multiple access with collision detection (CSMA/CD).
EuroReady product n. A product is EuroReady if the product, when used in accordance with its associated documentation, is capable of correctly processing monetary data in the euro denomination, respecting the euro currency formatting conventions (including the euro sign). This assumes that all other products (for example, hardware, software, and firmware) that are used with this product are also EuroReady. IBM hardware products that are EuroReady may or may not have an engraved euro sign key on their keyboards.
exabit 1. n. For processor storage, real and virtual storage, and channel volume, 260 or 1 152 921 504 606 846 976 bits. 2. n. For disk storage capacity and communications volume, 1 000 000 000 000 000 000 bits.
exabyte 1. n. For processor storage, real and virtual storage, and channel volume, 260 or 1 152 921 504 606 846 976 bytes. 2. n. For disk storage capacity and communications volume, 1 000 000 000 000 000 000 bytes.
exception n. An abnormal condition such as an I/O error encountered in processing a data set or a file.
EXEC n. In a VM operating system, a user-written command file that contains CMS commands, other user-written commands, and execution control statements, such as branches.
execute v. To perform the actions specified by a program or a portion of a program.
exit v. To execute an instruction within a section of a computer program (for example, within a loop, subroutine, or module) in order to terminate the execution of that section.
expansion slot n. A location in a computer where an optional adapter can be installed to add function to the computer.
exposure 1. n. Some aspect of a project that looks as though it may become a problem (as in: "That's a big exposure."). 2. n. Danger, risk. 3. n. Visibility to upper management (as in: "You'll get good exposure in this assignment.").
extended architecture n. An extension to System/370 architecture that takes advantage of continuing high performance enhancements to computer system hardware.
extranet n. A private, virtual network that uses access control and security features to restrict the usage of one or more intranets attached to the Internet to selected subscribers (such as personnel from a sponsoring company and its business partners).
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