E

EAB
See Enterprise Address Book (EAB).

EBCDIC
See extended binary-coded decimal interchange code (EBCDIC).

EBCDIC character
Any one of the symbols included in the 8-bit EBCDIC set.

EBCDIC double-byte encoding scheme
A structure that has separate, allocated coding space for control characters and graphic characters. Control characters do not have 16-bit codes in the EBCDIC structure definition. Graphic characters have a range from X'4141' to X'FEFE'. The space character is at X'4040'.

EBCDIC single-byte encoding scheme
An 8-bit-per-byte structure. The EBCDIC single-byte structure has a valid code-point range for X'00' to X'FF'. Control characters have a range from X'00' to X'3F'. Graphic characters have a range from X'41' to X'FE'. The space character is X'40'.

e-business
The transaction of business over an electronic medium such as the Internet.

ECMA
European Computer Manufacturer's Association.

e-commerce
The subset of e-business that involves the exchange of money for goods or services purchased over an electronic medium such as the Internet.

EDF
See Execution Diagnostic Facility (EDF).

edit
(1) To interactively add, change, delete, or rearrange the data; for example, to insert or remove characters, sentences, or paragraphs, or to insert or remove characters in dates or decimal numbers.
(2) To make changes to a document by adding, changing, or removing text.
(3) To change a numeric field for output by suppressing zeros and inserting commas, periods, currency symbols, the sign status, or other constant information.

edit code
A letter or number indicating that editing should be done according to a defined pattern before a field is displayed or printed. Contrast with edit word.

edit description
A description of a user-defined edit code. The system-recognized identifier is *EDTD.

editing character
In COBOL, a single character or a fixed 2-character combination that punctuates output.

edit line
In CoOperative Development Environment/400, a string of characters ended either by an end-of-line character sequence or by the end of the file.

editor program
A computer program designed to perform such functions as rearrangement, modification, and deletion of data in accordance to prescribed rules (A).

edit word
A user-defined word with a specific format that indicates how editing should be done. Contrast with edit code.

effective address overflow (EAO) exception
In Performance Tools, a condition in which the Licensed Internal Code must make address adjustments not made above the machine interface.

effective permissions
In DCE Security, the permissions granted to a principal as a result of a masking operation.

EIA
Electronic Industries Association.

EIA unit
A unit of measure, established by the Electronic Industries Association, equal to 44.45 millimeters (1.75 inches).

EIA-232
In data communications, a specification of the Electronic Industries Association (EIA) that defines the interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) using serial binary data interchange.

EJB
See Enterprise JavaBeans (EJB).

electronic commerce
See e-commerce.

electronic customer support
A part of the operating system that allows a customer to access: the question-and-answer (Q & A) function; problem analysis, reporting, and management; IBM product information; and technical information exchange.

electronic document
A document that is stored on the computer, instead of printed on paper.

electronic keystick
A device that slides into a slot on some AS/400 control panels. When the keystick is in place, it electronically unlocks functions at the key pad on the control panel. This allows a system operator to select an operating mode. When the keystick is removed, those functions are electronically locked, which prevents those without authority from placing the machine in some other mode.

electronic mail
Documents and messages sent through the system from one user to one or more users.

electronic mail (e-mail)
Correspondence in the form of messages transmitted between user workstations over a computer network.

electronic overlay
An AFP resource object that is a collection of predefined data, such as lines, shading, text, boxes, or logos, that can be merged with variable data on a page while printing. The system-recognized identifier for the object type is *OVL.

element
(1) In a list of parameter values, one value.
(2) Either a bar or a space in a bar of a bar code.
(3) In RPG, the smallest addressable unit of an array or table.
(4) In DCE Remote Procedure Call (RPC), any of the bits of a bit string, the octets of a octet string, or the octets by means of which the characters of a character string are represented.
(5) In AFP Utilities, the smallest unit, such as text, an image, or a bar code, used to design an AFP resource like an electronic overlay. See also element mark and element name.

elementary item
In COBOL, a data item that cannot be further logically subdivided.

element mark
In AFP Utilities, a mark that is used to show the position of an element on a display; for example, '*B005' where B means bar code and 005 is the fifth element. See also element and element name.

element name
In AFP Utilities, a name that appears in the image area instead of an element mark. See also element and element mark.

ELLC
See enhanced logical link control (ELLC).

e-mail
See electronic mail (e-mail).

embed
Insert or merge.

embedded blank
A space between characters within a unit of data.

embedded command
A command enclosed as a value within another command.

embedded SQL
SQL statements that are embedded within a program and are prepared in the program preparation process before the program is run. After it is prepared, the statement itself does not change, although values of host variables specified within the statement might change.

emitter
A program that takes the output from one system and converts the information into a different form.

EMN
See enterprise meeting notice (EMN).

emphasis
Highlighting, color change, or other visible indication of conditions relative to an object or choice that affects a user's ability to interact with that object or choice. Emphasis can also give a user additional information about the state of a choice or an object.

emulation
Imitation of one system or device by another.

emulation program
A control program that permits functions written for one system or device to be run on another system or device.

Encapsulated Security Payload (ESP)
In a Virtual Private Network (VPN), a security protocol that provides data confidentiality and integrity.

encapsulation
An object-oriented programming characteristic whereby the implementation details of a class are hidden from client programs. Client programs are only required to know the interface of a class (the signatures of the methods of the class and the names of the attributes of the class) to use the methods and attributes of the class.

encoded format
In query management, the format of the data in an externalized form file.

encoded-vector index
A DB2 UDB for AS/400 index that is specialized for quick row selection in query processing. This type of index also provides accurate database statistics, which can improve the optimization of queries. See also index and radix-tree index.

encoding scheme
(1) The set of rules by which graphic characters and control characters are given a specific encoded value. Standards organizations define encoding schemes, such as ASCII, Unicode, and ISO/IEC 10646. For example, in IBM, the EBCDIC encoding scheme is used for AS/400 systems and the PC encoding scheme for PCs.
(2) The underlying part of a code page where the following are defined:
(3) In DB2 UDB for AS/400, a set of rules to represent character data when converting from one type of character data to another, such as from ASCII to EBCDIC.

encrypt
In Cryptographic Support, to systematically scramble information so that it cannot be read without knowing the coding key.

encryption
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.

encryption algorithm
An algorithm that scrambles the data so that it becomes unreadable to someone who intercepts it.

encryption key
In the Distributed Computing Environment (DCE), a value used to encrypt data so that only possessors of the encryption key can decipher it.

endian
In the Distributed Computing Environment (DCE), an attribute of data representation that reflects how certain multi-octet data is stored in memory. See big endian and little endian.

ending attribute character
For a display file, the character following the last position in a field.

end node
In SNA, a node in an APPN network that can be a source or target node, but does not provide any routing or session services to any other node.

end-of-file delay
An interval during which the system holds a file open after the normal end of the file is reached until one or more records are updated or added to the end of the file. The length of the interval can be specified on the EOFDLY parameter.

End of Procedure Division
In COBOL, the physical position of a COBOL source program after which no further procedures appear.

end-of-tape marker (EOT marker)
A reflective material placed on a magnetic tape to indicate the end of the recording area.

end-of-text (ETX) character
The BSC transmission control character used to end a logical set of records that began with the start-of-text character. Contrast with end-of-transmission-block (ETB) character.

end-of-transmission-block (ETB) character
The BSC transmission control character used to end a block of records. Contrast with end-of-text (ETX) character.

end-of-transmission (EOT) character
The BSC transmission control character used to end transmission with the remote system.

endpoint
(1) The system that is the origin or destination of a session.
(2) In DCE Remote Procedure Call (RPC), an address of a specific server instance on a host.
(3) A host or gateway that, along with another endpoint and a security policy, comprises a Virtual Private Network (VPN) connection.

endpoint map
In DCE Remote Procedure Call, a database local to a node where local RPC servers register binding information associated with their interface identifiers and object identifiers. See endpoint map service. See also RPC daemon.

endpoint system
Any system that is running OS/400 and is connected to the central system. An endpoint system is defined from the central system for the purpose of performing Management Central functions.

endpoint map service
In DCE Remote Procedure Call, a service provided by the RPC daemon that maintains a system's endpoint map for local RPC servers. See endpoint map. See also partially bound binding handle and RPC daemon.

end program header
In COBOL, a combination of words, followed by a separator period, that indicates the end of a COBOL source program. The end program header is: END PROGRAM program-name.

end system
(1) In OSI, synonym for destination node.
(2) The last system in a chain of systems that are linked by any combination of TELNET and pass-through requests.

end-to-end connection type
In OSI, the type of network service connection used between the local and destination node, that is connection mode, connectionless mode, or both.

end-use dimension
A major part of the SystemView structure that defines how a systems management application should appear to an end-user.

eNetwork
See IBM eNetwork Software.

enforced subset match conversion (substitution)
A conversion where the characters that exist in both the source coded character set identifier (CCSID) and the target CCSID have their integrity maintained. Characters that are not included in the target CCSID are presented to the user as substitution characters. This substitution is permanent. Any loss of character integrity is permanent. An EBCDIC-encoded character that is in the source CCSID but not in the target CCSID is replaced with X'3F'.

enhanced logical link control (ELLC)
An X.25 protocol that allows the transfer of data link control information between two adjoining SNA nodes that are connected through an X.25 packet-switching data network. ELLC enhances error detection and recovery. Contrast with physical services header (PSH) and qualified logical link control (QLLC).

enhanced NWS
A character-based 5250 workstation with an enhanced character set that allows the presentation of characters that look like graphical symbols.

Enhanced 5250 Emulation
A program that allows a personal computer and a printer to be attached to an AS/400 system and perform the functions of one or two 5250 work stations on one twinaxial cable. The work station(s) can be one display station, two display stations, or one display station and one printer.

ENQ
See enquiry (ENQ) character.

enqueue
(1) In OS/400 application programming interfaces, an operation for placing items, such as messages, on a queue.
(2) In Client Access, an operation for placing items, such as messages, on a queue. Contrast with dequeue.

enquiry (ENQ) character
The BSC transmission control character usually used to request a response from the remote system or device.

enroll
In Backup Recovery and Media Services, to identify media to Backup Recovery and Media Services. Media initialized in Backup Recovery and Media Services does not need to be enrolled.

enrollment
In the OfficeVision program, the process of identifying a user to OfficeVision. This process includes creating a user profile (if one does not already exist), adding a system distribution directory entry (if one does not exist), and creating calendar information, such as start time and start day.

enrollment record
Information that describes an office user to OfficeVision, such as user profile information, system distribution directory information, and mail and calendar information.

enterprise
The entire business organization under discussion. An enterprise may consist of one or more establishments, divisions, plants, warehouses, and so on that require an information system.

Enterprise Address Book (EAB)
A collection of information about people, departments, and locations in an enterprise. Information about people may include telephone numbers, mailing addresses, and the department in which a person works. Department information may include the department name, the manager, and the department name the department reports to. Location information may contain a mailing address. On the AS/400 system, the EAB is the system distribution directory.

enterprise information system
In System Manager, all the resources that the SystemView applications manage and the functions for managing them.

Enterprise JavaBeans (EJB)
A specification of Sun Microsystems, Incorporated, that is part of the WebSphere Application Server Advanced Edition. EJB support allows your application to include sophisticated business components that run on your server. These components may include business logic with automatic distributed transactions and persistence to a relational database.

enterprise meeting notice architecture
In office applications, the architecture that specifies the structure of the data stream used for the interchange of meeting notice documents.

enterprise meeting notice (EMN)
In office applications, a data stream defined by the enterprise meeting notice architecture that is used to exchange meeting notice documents between systems.

entity
(1) In the DCE Cell Directory Service (CDS), any manageable element through the CDS namespace. Manageable elements include directories, object entries, servers, replicas, and clerks.
(2) For DCE Distributed Time Service, see DTS entity.
(3) In OSI, the representation of a layer on a given open system.

entity type
In the DCE Distributed Time Service (DTS), an identifier of an entity that determines whether it is a server or a clerk.

entry
(1) In COBOL, any descriptive set of consecutive clauses stopped by a separator period and written in the Identification Division, Environment Division, or Data Division of a COBOL program.
(2) In the DCE X/Open Directory Service, the part of the directory information base (DIB) that contains information relating to a single directory object. Each entry consists of directory attributes.

entry field
An area on a display where a user can enter information, unless the field is read-only. The boundaries of an entry field are usually indicated.

entry format
The description of a personal directory entry. Each personal directory entry has an identical structure. The entry structure determines the type and size of each field in a personal directory entry.

entry point
The address or label of the first instruction processed or entered in a program, routine, or subroutine. A program, routine, or subroutine can have a number of different entry points, each corresponding to a different function or purpose.

entry point vector (EPV)
In DCE Remote Procedure Call (RPC), a list of addresses for the entry points of a set of remote procedures that implements the operations declared in an interface definition.

enumeration data type
In the C language, a data type that represents a set of values that a user defines.

envelope
(1) In DCE Security, the means used to transport authentication data and conversation keys between the security server and principals.
(2) A string of data representing information about a message aside from the attachments and its recipients.

envelope type
A value used to define the format and contents of an envelope, so that the programs that work with specific types of envelopes are supported. The envelope types supported on a system are defined when the mail server framework is configured. The valued associated with an envelope type must be a unique type value.

environment clause
In COBOL, a clause that appears as part of an Environment Division entry.

Environment Division
One of the four main parts of a COBOL program. The Environment Division describes the computers on which the source program is compiled and those on which the object program is run; it also provides a connection between the logical concept of files and their records, and the physical characteristics of the devices on which files are stored.

environment variable
Character strings of the form name=value. Environment variables are available to an OS/400 job through the set of programming interfaces and CL commands. The environment variables are also addressable through the C language environ array. Environment variables are used to set a working environment for the current job.

EOT
See end-of-transmission (EOT) character.

EOT marker
See end-of-tape marker (EOT marker).

EP
See Error Protocol (EP).

epoch number
In the DTS Distributed Time Service, an attribute that a server appends to the time values it sends to other servers. Servers use time values only from other servers with whom they share epoch numbers.

epoch timestamp
In the DCE Cell Directory Service (CDS), a timestamp that identifies directory replicas as being part of the same set. CDS uses the epoch timestamp when it performs a skulk operation on a directory.

EPV
See entry point vector (EPV).

equate name
In Interactive Source Debugger, a shorter name assigned to a command that is used often. The equate name, when called, performs the same function as the command.

error log
A record of machine checks, device errors, and media statistics.

Error Protocol (EP)
A protocol that provides a means for an Internetwork Packet Exchange (IPX) system to report that is has detected an error, and as a result of that error, the IPX system has discarded an IPX packet.

error tolerance
In the DCE Distributed Time Service (DTS), the amount of system clock inaccuracy to which the DCE Time Service responds by abruptly setting the system clock to the computed time, rather than gradually adjusting the clock.

escape character
In SQL, the symbol used to enclose a delimited identifier. The symbol is the quotation mark ("), except in COBOL programs where the symbol can be specified by the user as either a quotation mark or an apostrophe.

escape message
A message that reports a condition that caused the program to end before the requested function was complete.

escape sequence
In the C language, a sequence made up of an escape character followed by 1 or more characters that indicate the following characters are to be interpreted by a different code or according to a different coded character set.

ETB
See end-of-transmission-block (ETB) character.

Ethernet
A type of local area network that is supported by the Operating System/400 licensed program. OS/400 Ethernet provides support for the Digital Equipment Corporation, Intel Corporation, and Xerox standard (Ethernet Version 2) and the IEEE 802.3 standard. These local area networks use Carrier Sense Multiple Access with Collision Detection (CSMA/CD) as the media access method.

ETX
See end-of-text (ETX) character.

even footer
In the OfficeVision program, a footer that is printed only on even-numbered pages. Compare with odd footer.

even header
In the OfficeVision program, a header that is printed only on even-numbered pages. Compare with odd header.

even positive acknowledgment
See ACK0.

event
(1) In VisualAge RPG, a representation of a change that occurs to a part. The change enables other interested parts to receive notification when something about the part changes. For example, a push button generates an event by signalling that is has been clicked, which may cause another part to display a window.
(2) In the OfficeVision calendar function, an item scheduled on a single calendar (for only one attendee), which includes the time and description.
(3) In OSI, the occurrence of a well-defined situation. Events may be planned (for example, transactions), or they may be spontaneous or unplanned (for example, faults). An agent reports events to its managers.
(4) In System Manager, a significant occurrence, such as the end of processing or the failure of a subsystem.

event action list
In VisualAge RPG, a list of controls indicating the action subroutine that is to be called by the control's event.

event filter
In OSI, a method for excluding certain types of events so that they are not reported. Synonymous with filter.

event log
A log that contains information about events for a particular system or group, for a particular metric, or for all the events that are associated with a specific monitor.

event report
In OSI, the notification of a manager by an agent of an event.

events file
In CoOperative Development Environment/400, a machine-readable file, created by a compiler or when the Verify program choice is selected, that contains information about locations of errors in a source file.

EX
See exception response.

exact end position
In RPG, an entry on the output specifications that indicates where the end position of a field or constant is to be placed in the output record. Contrast with relative end position.

exact-name format
In AFP support, a print descriptor naming convention that uses system-specific (actual) group names instead of group alias names.

exact search
In the OfficeVision program, a search of all filed documents or personal directory entries for details that correspond exactly to the search values.

EXCEPT group name
In RPG, a name used in the place of indicators to identify a record or group of records written at exception output time.

exception
(1) In VisualAge RPG, an event or situation that prevents, or could prevent, an action requested by a user from being completed in a manner that user would expect. Exceptions occur when a product is unable to interpret a user's input.
(2) An event during a time when a program is running that prevents the program from continuing normally; generally, an error. See also exception handler.

exceptional wait
In Performance Tools, that portion of internal response time that cannot be attributed to the use of the processor and disk. An exceptional wait is caused by contention for internal resources of the system, for example, waiting for a lock on a database record.

exception/error handling
In RPG, user-written code that handles program or file exceptions/errors. If the program or file exceptions/errors are not controlled by the user, the RPG default error handler receives control.

exception handler
In Java, a block of code that reacts to a specific type of exception. If the exception is for an error that the program can recover from, the program can resume running after the exception handler has run.

exception request
In SNA, a request that replaces another request in which an error was detected. Note: The exception request contains a 4-byte sense field that identifies the error in the original request and, except if there were some path errors, is sent to the destination of the original request; if possible, the sense data is returned in a negative response to the sender of the original request.

exception response
In SNA, a value in the form-of-response-requested field of a request header. The value requests the receiver to return a response only if the request is unacceptable as received or cannot be processed; that is, only a negative response can be returned. Contrast with definite response.

exchange log name
A process used when sessions are first established to determine which log is being used by the remote system.

exchange media
The diskette or the tape that the user uses when exchanging data with other systems.

exchange station ID
In communications, a data link command or response for recognizing the primary station and a secondary station.

exclude authority
An object authority that prevents the user from using the object or its contents. Contrast with all authority.

exclusive allow-read lock state
The lock on an object that allows only one job to use the object, but allows other jobs to read the object. The predefined value for this lock state is *EXCLRD.

exclusive lock
In DB2 UDB for AS/400, a lock that prevents application processes that are running concurrently from accessing row data.

exclusive lock state
The lock on an object that allows only one job to use the object; no other job can use the object. The predefined value for this lock state is *EXCL.

exclusive-OR
A logic operator having the property that if P is a binary digit and Q is a binary digit and either P or Q is 1, but not both, then P exclusive-OR Q is 1.

EXEC Interface Block (EIB)
A control block associated with a CICS task. This block is used for direct communication between CICS and command-level application programs.

executable statement
In DB2 UDB for AS/400, an SQL statement that can be embedded in an application program, dynamically prepared and executed, or issued interactively.

execute authority
An object authority that allows the user to run a program or procedure or to search a library or directory. See also add authority, delete authority, read authority, and update authority.

Execution Diagnostic Facility (EDF)
In CICS, a facility that helps an application programmer to debug an application by going through its CICS commands. The programmer can change values in the application while it is running.

execution semantics
In the Distributed Computing Environment (DCE), the rules of execution for a Remote Procedure Call (RPC), including the effect of multiple invocations on the outcome of a procedure's operation. See at-most-once semantics, broadcast semantics, idempotent semantics, and maybe semantics.

exit
A routine, normally user-supplied, that receives control from the system.

exit point
A specific point in a system function or program where control may be passed to one or more specified exit programs.

exit point provider
The person responsible for defining the exit point information, defining the format of the data the exit program receives, and calling the exit programs.

exit program
(1) A user-written program that is given control during operation of a system function.
(2) A program to which control is passed from an exit point.

exit status
The return value from a thread. A variable of type void * typically contains a pointer to a control block pointer or a return value that shows under what conditions the thread ended.

expand
In the Distributed Computing Environment (DCE), to display the contents of (open) a directory using the Cell Directory Service (CDS) Browser. Contrast with collapse.

expanded communications buffer
A feature of the 3741 device that allows multiple records to be transmitted or received in one block of data.

expanded memory
Personal computer memory that is addressed by DOS, from 640KB to 1MB, to increase conventional memory. Contrast with conventional memory and extended memory.

expansion slots
Openings in the back of the personal computer where cards or adapters can be installed.

expansion unit
A feature that can be connected to a system unit to provide additional storage and processing capacity.

expedited data
In OSI, a data transfer service provided by the session layer to transfer a small amount of data that is not subject to permission-to-send and flow-control restrictions. The OSI layers attempt to expedite the transfer of such data.

expert cache
An extension of the storage management function of the OS/400 operating system that allows the single-level storage architecture to take better advantage of the main storage (cache) capacities.

expiration age
In the Distributed Computing Environment (DCE), the amount of time that a local copy of name service data from an NSI attribute remains unchanged before a request from an RPC application for the attribute requires its updating. See also NSI attribute.

expiration date
(1) The date after which the file on the diskette or tape volume is no longer protected from being automatically deleted by the system.
(2) The date after which a database file member should not be used.
(3) In the OfficeVision program, the date that a document or a reference to a document should be deleted from the system by the user.

expired
In Backup Recovery and Media Services, to denote when media is available for a rewrite operation. Media is automatically expired when both the retention period (expiration date) and storage duration have been satisfied.

explicit binding method
In the Distributed Computing Environment (DCE), the explicit method of managing the binding for a Remote Procedure Call in which a Remote Procedure Call passes a binding handle as its first parameter. See automatic binding method, binding handle, and implicit binding method.

explicit scope terminator
In COBOL, a reserved word that ends the scope of a particular Procedure Division statement.

exponent
(1) A number, indicating to which power another number (the base) is to be raised.
(2) In floating-point format, an integer constant specifying the power of ten by which the base of the decimal floating-point number is to be multiplied.
(3) In COBOL, exponentiation is indicated with the symbol ** followed by an exponent.

exponentiation
The process in which a quantity is raised to a power.

export
(1) In Network File System (NFS), to make file systems on a server available to remote clients.
(2) In the Application Development Manager feature of the Application Development ToolSet licensed program, to copy a single part or the components of an application from an Application Development Manager project into a particular AS/400 library.
(3) An external symbol defined in a module or service program that is available for use by other modules or programs. See also external symbol. Contrast with import.
(4) In DCE Remote Procedure Call (RPC), to place the server binding information associated with an RPC interface or a list of object Universal Unique Identifiers (UUIDs) or both into an entry in a name service database.
(5) In the Distributed Computing Environment (DCE), to provide access information for an RPC interface. Contrast with unexport.
(6) In VisualAge RPG, a function that converts an internal file to some standard file format for use outside of an application.

exported form
In query management, the source file member that results from running an EXPORT FORM command.

exported query
In query management, the source file member that results from running an EXPORT QUERY command.

exposed name
In DB2 UDB for AS/400, a correlation name, or a table name or view name for which a correlation name is not specified.

expression
(1) In C, a group of constants or variables separated by operators that yields a single value.
(2) In DDS, a pair of values that represents a single parameter value.
(3) In Query, a representation of a value with variables or constants appearing alone or in combination with arithmetic operators.
(4) In REXX, a general means for combining one or more pieces of data in various ways to produce a result, usually different from the original data. Expressions consist of terms (literal strings, function calls, and symbols), and zero or more operators.
(5) In SQL, a variable or constant specified alone or in combination with functions and either arithmetic operators or concatenation operators that supply a single value, after being calculated, to the program.

Extended Adaptive Cache
A large high-speed memory that is used exclusively to store user data that would otherwise have been accessed from one or more disks. Extended Adaptive Cache is managed by the AS/400 storage controller and uses a large read cache device (RCD) for memory. It functions by generating statistical information for the data flow and then using intelligent management strategies when it populates the cache with data. Extended Adaptive Cache can offer dramatic performance enhancements on many types of data workloads.

Extended Adaptive Cache Simulator
A performance tool that allows AS/400 users to assess the benefits of an Extended Adaptive Cache before purchasing one. When the Extended Adaptive Cache simulator is active on a specified storage controller, performance information is generated for a system's actual workload over time.

extended attribute
(1) Information attached to an object that describes the object to an application system or user.
(2) A characteristic of an OS/2 file or a shared folder file. Each extended attribute consists of a name, a value, and a set of flags.

extended attribute flags
The flags that are stored for the extended attribute, such as the read/write flag.

extended attribute name
The name that identifies the specific extended attribute that is to be stored, changed, or retrieved.

extended attribute subprofile
The interchange document subprofile that contains non-DIA extended attributes for a document.

extended attribute value
The data stored in an extended attribute.

extended binary-coded decimal interchange code (EBCDIC)
A coded character set consisting of 8-bit coded characters.

extended character processing
A function of the operating system that is required to make characters stored in a DBCS font file available to a DBCS-capable work station. Basic characters, which are stored in the work station, do not require extended character processing. Extended characters, which are stored in a DBCS font table, require extended character processing before they can be displayed or printed. See also basic characters and extended characters.

extended characters
Double-byte characters that are stored in a DBCS font file, not in the hardware of a DBCS-capable work station. When displaying or printing extended characters, the work station receives them from the DBCS font table under control of the extended character processing function of the operating system. Contrast with basic characters. See also extended character processing.

extended help
Help that explains the purpose of the display. Extended help appears if the user presses the Help key when the cursor is outside the areas for which contextual help is available. Contrast with contextual help.

extended interface
In query management, the set of language-specific interfaces that allows commands requiring access to program variables to run. The extended interface includes:

Communications area

Command length

Command string

Number of keywords or variables

Array of keyword or variable name lengths

Array of keyword or variable names

Array of keyword or variable value lengths

Array of keyword or variable values

Value type

extended memory
Personal computer memory that is addressed by DOS, from 1MB to 16MB, to increase conventional memory and expanded memory. Contrast with conventional memory and expanded memory.

extended parameter list
In query management, the arguments of the extended interface that are not defined on the short interface.

extended UNIX coded character set (EUC)
A set of characters that contains mixed characters. EUC is the mixture of the ISO 7- or 8-bit code page and up to 3 other code pages that can have characters represented internally in 1 to 3 bytes. Extended UNIX coded character set uses multiple shift-in and shift-out control characters and TCP/IP escape sequences within the data stream to switch between four different character sets.

extend mode
(1) In COBOL, a method of adding records to the end of a sequential file when the file is opened.
(2) In COBOL, the state of a file after running an OPEN statement, with the EXTEND phrase specified for that file, and before running a CLOSE statement, without the REEL or UNIT phrase specified for that file.

Extensible Markup Language (XML)
A standard metalanguage for defining markup languages that was derived from and is a subset of SGML. XML omits the more complex and less-used parts of SGML and makes it much easier to (a) write applications to handle document types, (b) author and manage structured information, and (c) transmit and share structured information across diverse computing systems. The use of XML does not require the robust applications and processing that is necessary for SGML. XML is being developed under the auspices of the World Wide Web Consortium (W3C).

external data
(1) Data that is exported from one procedure and imported into another procedure. Contrast with internal data.
(2) In COBOL, the data described in a program as external data items and external file connectors.

external data definition
In the C language, a definition appearing outside a function. The defined object is accessible to all functions that are located within the same source file as the definition and that follow the definition in that source file.

external data item
In COBOL, a data item that is described as part of an external record in one or more programs of a run unit and which itself may be referred to from any program in which it is described.

external data record
In COBOL, a logical record that is described in one or more programs of a run unit and whose constituent data items may be referred to from any program in which they are described.

external file connector
In COBOL, a file connector that is accessible to one or more programs in the run unit.

external indicators
In RPG, indicators that can be set by another program before a program is run, or changed by another program while the program is running. Valid external indicators are U1 through U8.

externalized form
In query management, the name of the file resulting from running an EXPORT command against a form.

externalized query
In query management, the name of the form resulting from running an EXPORT command against a query.

externally described data
Data contained in a file for which the fields and the records are described outside of the program (such as with files created by DDS, IDDU, or DB2 UDB for AS/400) that processes the file. Contrast with program-described data.

externally described file
A file in which the records and fields are described to the system when the file is created, and used by the program when the file is processed. Contrast with program-described file.

external message queue
A message queue used by all programs and procedures running within a job to send and to receive messages outside a job, for example, between an interactive job and the workstation user.

external object
An object that has a defined object type (such as *FILE or *PGM). In general, external objects can be displayed by a user. See also object. Contrast with internal object.

external procedure
A procedure that is not contained within a block. Contrast with internal procedure.

external routine
In REXX, a program external to the user's program, language processor, or both. These routines can be written in any language (including REXX) that supports the system-dependent interfaces used by REXX to start it.

external storage
Data storage not located in main or auxiliary storage, such as tape or diskette.

external switch
In COBOL, a hardware or software device, defined and named by the compiler, that is used to indicate that one of two states exists.

external symbol
(1) An entry-point name or external variable that is defined or referred to in a particular module or program.
(2) An item defined in a high-level language program that represents such things as procedures or variables. Resolving external symbols is the means by which the binder connects modules to form a bound program or a service program.

external system
A system that exists outside a particular network.

external variable
A variable that is outside the lexical scope of the function, procedure, or program that is calling it.

extract services
In OSI, callable services that obtain optional information from OSI Communications Subsystem. Contrast with action services and set services.

extrapartition
In CICS, a type of transient data queue. Extrapartition destinations can be accessed either within the CICS environment or outside of CICS; they can be defined as either input or output.

EZ-Setup
A wizard that allows user to install Operations Navigator; set the system name, date, time, and some basic security values, and perform some other tasks.

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