of
the data to any unauthorized recipient. Contrast
with
decrypt.
extended
binary-coded
decimal
interchange
code
(EBCDIC). A coded
character
set
of 256
eight-bit
characters.
F
field. See
display
field.
file. A named
set
of
records
stored
or
processed as a
unit.
fixed
disk. A
rigid
magnetic
disk
used in a fixed
disk
drive.
fixed
disk
drive.
A
disk
storage
device
that
reads and
writes
on
rigid
magnetic
disks.
full
duplex. Synonym
for
duplex.
G
gateway.
(1)
A functional
unit
that connects
two
computer
networks
of
different
network
architectures.
generate. In 3174
central
site
customizing, to
write
a
Control
diskette
containing
the
customizing
data
for
a
particular
controller.
Also, to
print
a
mailing
address
label and a
diskette
label
for
a
particular
controller.
H
host
application
program.
An application
program
processed in the host
computer.
host
attachment. A
mode
of SNA
communication
in
which
the
processor
acts as a
secondary
SNA
device.
host
computer.
(1) In a
computer
network, a
computer
that
provides
end users
with
services
such as
computation
and
data
bases and that
usually
performs
network
control
functions. (2) The
primary
or
controlling
computer
in a
multiple-computer
installation.
(3)
A
computer
used to
prepare
programs
for
use on
another
computer
or
on
another
data
processing
system;
for
example, a
computer
used
to
compile
link
edit,
or
test
programs
to be used on
another
system. (4) Synonym
for
host
processor.
host
logical
unit
(lU).
An SNA logical
unit
(LU) located
in a host processor,
for
example, an ACF/VTAM
application
program.
host
processor. (1) A
processor
that
controls
all
or
part
of a
user
application
network.
(2) In a network,
the processing
unit
in
which
resides the access method
for
the network. (3) In an SNA network, the
processing
unit
that contains a
system
services
control
point
(SSCP).
(4)
A
processing
unit
that executes
the
access
method
for
attached
communication
controllers.
(5) The
processing
unit
required
to
create
and
maintain
PSS.
(6)
Synonymous with
host
computer.
host
system. (1) A
data
processing system used
to
prepare
programs
and
operating
environments
for
use
on
another
computer
or
controller.
(2)
The
data
processing
system
to
which
a
network
is connected and
with
which the
system
can communicate. (3) The
controlling
or
highest-level system in a
data
communication
configuration;
for
example, a System/38
is the host
system
for
the
work
stations connected to it.
IBM
Cabling
System. A
permanently
installed
wiring
system that
eliminates
the need to
rewire
when
terminals
are
moved
from
one location to
another
within
an office
complex.
It
allows
transmission
of data
at
very
high speeds and is the foundation
for
installing
a local
area
network.
immediate
access storage. A
storage
device
whose
access
time
is
negligible
in
comparison
with
other
operating times.
initial
microcode
load
(IMl).
The action of
loading
the
operational
microcode.
inputloutput
(I/O).
(1)
Pertaining
to a
device
whose
parts can
perform
an
input
process
and an output
process at the
same
time. (2) Pertaining
to
a
functional
unit
or
channel
involved
in an
input
process,
output process,
or
both,
concurrently
or
not, and
to
the
data
involved
in such a process.
(3)
Pertaining
to
input, output,
or
both.
interface. (1) A
shared
boundary
between
two
functional units,
defined
by functional
characteristics,
common
physical
interconnection
characteristics,
signal
characteristics,
and
other
characteristics
as
appropriate.
(2) A
shared
boundary. An
interface
may
be a
hardware
component
to
link
two
devices
or
a
portion of
storage
or
registers
accessed by
two
or
more
computer
programs.
(3)
Hardware, software,
or
both,
that
links
systems,
programs,
or
devices.
L
leased line. Synonym
for
nons
witched
line.
link. The
logical
connection
between nodes
including
the end-to-end
link
control
procedures.
local. Pertaining to a
device
accessed
directly
without
use of a
telecommunication
line. Synonym
for
channel-attached.
Contrast
with
remote.
X-8 IBM 3270
Information
Display System 3174
Establishment
Controller
Introduction
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