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1024-byte format
A format for diskette 2D diskettes with 1024 bytes per sector and 8 sectors per track.

128-byte format
A format for diskette 1 diskettes with 128 bytes per sector and 26 sectors per track.

16MB boundary
A notional boundary in virtual storage. Addresses below the 16MB boundary can be accessed by 24-bit or 31-bit addressing. Addresses on or above the 16MB boundary can be accessed only by 31-bit addressing. The numerical value of 16MB is 2 to the power of 24, 16 777 216

16 megabyte line
Synonym for 16MB boundary.

1980 X.25 call
A call that conforms to the 1980 X.25 protocol specifications.

1984 X.25 call
A call that conforms to the 1984 X.25 protocol specifications.

1988 X.25 call
A call that conforms to the 1988 X.25 protocol specifications.

256-byte format
A format for diskette 2D diskettes with 256 bytes per sector and 26 sectors per track.

2 B-channel transfer feature
See Integrated Services Digital Network two B-channel transfer.

2KP transaction
A SET transaction in which the cardholder messages are unsigned and two key pairs (one for the merchant and one for the payment gateway) are used for encryption.

2PKDP
See Two-Party Key Distribution Protocol.

3174 Peer Communications Network
A function that provides peer-to-peer communication for programmable workstations connected to an IBM 3174 Control Unit through IBM 3270 communication adapters using coaxial cable or telephone twisted-pair wire. This function is achieved through the following: (a) 3174 Peer Communications Network network-driver-interface-specification (NDIS) medium-access-control (MAC) driver, and (b) 3174 Peer Communications Network program running on the IBM 3174 Control Unit.

31-bit storage addressing
The storage address structure available in an MVS/XA operating system.

3270 application
An application on a host system accessed by a 3270 terminal device. Typically, 3270 applications run under CICS or IMS.

3270 attention field
A field on a display screen that contains a null, a space, or an ampersand in the first position. The field can be selected using the Cursor Select key, which causes data to be sent to the host system.

3270 data stream
The commands, control codes, orders, attributes, and data or structured fields for 3270 devices that are transmitted between an application program and a terminal. Data being transferred from or to an allocated primary or tertiary device, or to the host system, as a continuous stream of data and 3270 Information Display System control elements in character form.

3270 device emulation
The OS/400 support that allows a system to appear as a 3274 Control Unit in a BSC multipoint network or an SNA network.

3270 display emulation
The function of OS/400 3270 device emulation support that converts 3270 data streams intended for a 3278 display station into data streams that can be recognized by a display station attached to the system.

3270 emulation
The use of software that enables a client to emulate an IBM 3270 display station or printer, and to use the functions of an IBM host system.

3270 host application
An application on the IBM System/370, System/390, or iSeries that interacts with terminals supporting the 3270 data stream.

3270 printer emulation
The function of OS/400 3270 device emulation support that converts 3270, DSC, and SCS data streams intended for a 328X printer into data streams that can be recognized by a printer attached to the system.

3270 server
A function of DirectTalk which provides a software interface between DirectTalk and IBM System/370, System/390, or iSeries architecture business applications that interact with terminals supporting the 3270 data stream. See also custom server.

3270 service project
In 3270 terminal service development, resources are organized hierarchically under a 3270 terminal service project. The 3270 terminal service project appears as a folder in the workbench. It is recommended that each 3270 terminal service being developed have its own project folder. A 3270 terminal service project contains the following resources: a systems classpath file that indicates the classpath for a Java project. This file is generated automatically when you create a service project; a systems .ws-providers file that lists the service providers currently installed on your system. This file is automatically generated when you create a service project; one terminal file that contains the information necessary to connect to the host system; multiple .screen files (with XSD extensions) that contain the screen definition information; and one or more dialog files dialog that you record and save. The dialog file describes where a web service is deployed and what operations the service provides.

3270 service recorder
A 3270 terminal service development tool that enables a user to do the following: establish a connection to a host system, display a 3270 application within the edit area of the 3270 terminal service recorder, interact with the 3270 application in real time by entering data and pressing PF keys, import screens from a 3270 application by saving the screen definition in the workbench, record a dialog of interactions with the 3270 application, and play back a dialog so that the sequence of screens recorded in the dialog can be validated.

370 mode
In CICS/VSE, An operation mode of the supervisor (generated with MODE=370) of a VSE system. Such a supervisor supports multiple virtual address spaces and requires a processor of the System/370 and /390 architecture.

3G
See third generation.

3GL
See third generation language.

3KP transaction
A SET transaction in which the cardholder messages are unsigned and three key pairs (one for the merchant, one for the payment gateway, and one for the cardholder) are used for encryption.

3-state check box
A square box with associated text that represents a choice. Unlike a regular check box, which has only two states (selected and deselected), a 3-state check box has three states (selected, deselected, and unavailable). The unavailable state is displayed as a halftone and denotes that the 3-state check box cannot be selected.

400/REXX
See REXX/400.

512-byte format
A format for diskette 1 diskettes with 512 bytes per sector and 8 sectors per track.

5250 display
Any display device that uses the 5250 data stream. See also Programming Development Manager.

5250 emulation
Any one of many licensed programs that allow a personal computer to perform like a 5250 display station or printer and to use the functions of an i5/OS operating system.

5250 pass-through
See display station pass-through.

5290 display
Any display station from the 5290 Display System.

5ESS
(1) The ISDN protocol implemented on the 5ESS switch, providing 23 B-channels and a D-channel over a T1 trunk.
(2) A Lucent Technologies switch.

6309 Digital Trunk Quad Adapter
See Digital Trunk Quad Adapter.

6310 Digital Trunk Extended Adapter
See Digital Trunk Extended Adapter.

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