IBM Computer Hardware 2 Instrukcja Użytkownika Strona 499

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CCA Release 2.54
U
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)
V
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.
W
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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