L
LIC.
Licensed
Internal
Code.
Licensed
Internal
Code
(LIC).
Software
provided
for
use
on
specific
IBM
machines
and
licensed
to
customers
under
the
terms
of
IBM’s
Customer
Agreement.
Microcode
can
be
Licensed
Internal
Code
and
licensed
as
such.
link.
(1)
In
an
ESCON
or
FICON
environment,
the
physical
connection
and
transmission
medium
used
between
an
optical
transmitter
and
an
optical
receiver.
A
link
consists
of
two
conductors,
one
used
for
sending
and
the
other
for
receiving,
providing
a
duplex
communication
path.
(2)
In
an
ESCON
or
FICON
I/O
interface,
the
physical
connection
and
transmission
medium
used
between
a
channel
and
a
control
unit,
a
channel
and
an
ESCD,
a
control
unit
and
an
ESCD,
or,
at
times,
between
two
ESCDs.
local.
Synonym
for
channel-attached
.
log.
(1)
To
record,
for
example,
to
log
all
messages
on
the
system
printer.
(2)
A
record
of
events
that
have
occurred.
logical
address.
The
address
found
in
the
instruction
address
portion
of
the
program
status
word
(PSW).
If
translation
is
off,
the
logical
address
is
the
real
address.
If
translation
is
on,
the
logical
address
is
the
virtual
address.
logical
partition
(LP).
A
subset
of
the
processor
hardware
that
is
defined
to
support
the
operation
of
a
system
control
program
(SCP).
See
also
logically
partitioned
(LPAR)
mode
.
logical
processor.
In
LPAR
mode,
a
central
processor
in
a
logical
partition.
logically
partitioned
(LPAR)
mode.
A
central
processor
mode,
available
on
the
Configuration
frame
when
using
the
PR/SM
feature,
that
allows
an
operator
to
allocate
processor
unit
hardware
resources
among
logical
partitions.
Contrast
with
basic
mode
.
logout.
Log
data
that
has
been
collected,
formatted,
and
recorded.
LP.
Logical
partition.
LPAR.
Logically
partitioned.
M
machine
check.
An
error
condition
that
is
caused
by
an
equipment
malfunction.
MB.
Megabyte.
megabyte
(MB).
(1)
A
unit
of
measure
for
storage
size.
One
megabyte
equals
1
048
576
bytes.
(2)
Loosely,
one
million
bytes.
monitor.
A
device
that
observes
and
records
selected
activities
within
a
data
processing
system
for
analysis.
multidrop.
A
network
configuration
in
which
there
are
one
or
more
intermediate
nodes
on
the
path
between
a
central
node
and
an
endpoint
node.
(T)
multidrop
topology.
A
network
topology
that
allows
multiple
control
units
to
share
a
common
channel
path,
reducing
the
number
of
paths
between
channels
and
control
units.
Contrast
with
switched
point-to-point
topology
.
See
also
point-to-point
topology
.
multiple
image
facility
(MIF).
A
facility
that
allows
channels
to
be
shared
among
PR/SM
logical
partitions
in
an
ESCON
environment.
MVS/ESA.
Multiple
Virtual
Storage/Enterprise
Systems
Architecture.
N
network.
(1)
An
arrangement
of
nodes
and
connecting
branches.
(T)
(2)
A
configuration
of
data
processing
devices
and
software
connected
for
information
exchange.
nybble.
Equal
to
4
bits.
O
offline.
(1)
Pertaining
to
the
operation
of
a
functional
unit
that
takes
place
either
independently
of,
or
in
parallel
with,
the
main
operation
of
a
computer.
(T)
(2)
Neither
controlled
by,
nor
communicating
with,
a
computer.
Contrast
with
online
.
online.
(1)
Pertaining
to
the
operation
of
a
functional
unit
when
under
the
direct
control
of
a
computer.
(T)
(2)
Pertaining
to
a
user&csq.s
ability
to
interact
with
a
computer.
(A)
(3)
Pertaining
to
a
user’s
access
to
a
computer
via
a
terminal.
(A)
(4)
Controlled
by,
or
communicating
with,
a
computer.
Contrast
with
offline
.
operating
system.
Software
that
controls
the
execution
of
programs
and
that
may
provide
services
such
as
resource
allocation,
scheduling,
input/output
control,
and
data
management.
Although
operating
systems
are
predominantly
software,
partial
hardware
implementations
are
possible.
(T)
operator
console.
(1)
A
functional
unit
containing
devices
that
are
used
for
communications
between
a
computer
operator
and
a
computer.
(T)
(2)
A
display
used
for
communication
between
the
operator
and
the
system,
used
primarily
to
specify
information
concerning
application
programs
and
I/O
operations
and
to
monitor
system
operation.
D-6
PR/SM
Planning
Guide
Summary of Contents for Z9
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