IBM Computer Hardware 2 Manual do Utilizador descarregar pdf (Página 499)

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101

CCA Release 2.54

Unique Key Per Transaction (UKPT). UKPT is a

cryptographic process that can be used to decipher PIN

blocks in a transaction.

user-exit routine. A user-written routine that receives

control at predefined user-exit points.

user ID. User identification.

userid. A string of characters that uniquely identifies a

user to the system.

utility program. A computer program in general

support of computer processes. (T)

verb. A function that has an entry-point-name and a

fixed-length parameter list. The procedure call for a

verb uses the standard syntax of a programming

language.

virtual machine (VM). A functional simulation of a

computer and its associated devices. Each virtual

machine is controlled by a suitable operating system.

VM controls concurrent execution of multiple virtual

machines on one host computer.

VISA. A financial institution consortium which defines

four PIN-block formats and a method of PIN verification.

workstation. A terminal or microcomputer, usually one

that is connected to a mainframe or to a network, at

which a user can perform applications.

Numerics

4758. IBM 4758 PCI Cryptographic Coprocessor.

Glossary X-9

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