A specified
period of time after which the server reclaims any resources that are no
longer being used for what they were originally allocated. An example
of garbage collection is the reclaiming of any Internet Protocol (IP)
addresses whose leases have ended. See also Java garbage
collection.
gateway
(1) A program used to connect
two systems that use different communications protocols.
(2) In TCP/IP, a device used to
connect two systems that use either the same or different communications
protocols.
(3) A device that acts as a router,
but occurs at the transport layer, to transfer packets between
networks.
GCGID
See graphic character
global identifier (GCGID).
GCS
See Group Control System
(GCS).
GCSGID
See graphic character
set global identifier (GCSGID).
GDA
See global directory
agent (GDA).
GDDM
See graphical data
display manager (GDDM).
GDF
See graphics data format
(GDF).
GDF file
See graphics data
format (GDF) file.
GDS
See general data stream
(GDS).
general activity
In Backup
Recovery and Media Services, an instruction to perform a specific operation
such as *LOAD (load a new tape) or *EXIT (perform user
exit).
general data stream (GDS)
A
structured field that precedes all mapped conversation user data in the
communications data stream. It consists of a length (LL), which is
defined as the first 2 bytes of the structured field, and a general data
stream identifier (GDS ID), which is defined as the next 2 bytes following the
length field that identifies the GDS-defined format of the
data.
generalized interactive executive (GIX)
A
function of the NetView Distribution Manager licensed program that provides
the host system user with interactive use of the NetView Distribution Manager
program.
general-purpose library
The
library shipped with the system that contains IBM-provided objects required
for many system functions and user-created objects that are not explicitly
placed in a different library when they are created. Named
QGPL.
General Use Programming Interface (GUPI)
An
interface, with few restrictions, for use in customer-written programs.
The majority of programming interfaces are general-use programming interfaces,
and are appropriate in a wide variety of application
programs.
generate
In DB2 UDB for AS/400,
to produce, through the actions performed by a precompiler. For
example, the precompiler generates host language statements and declarations
that are embedded into the input source, and this modified source is then used
as input to a compiler.
generic
Relating to, or
characteristic of, a whole group or class.
generic alert
A
product-independent method of encoding alert data by means of both (a) code
points indexing short units of stored text and (b)
text.
generic controller description
An
asynchronous controller description that is reserved for incoming calls on an
X.25 packet-switching data network from a remote system or device that
does not use SNA transmission protocols and whose location name and identifier
are defined in configuration list QASYNCLOC in library QSYS. See also
asynchronous controller
description.
generic envelope type (GET)
A value
that defines a specific envelope type. The contents of this envelope
are published so that it can be used as a common interchange
format.
generic name
(1) The characters
common to object names that can be used to identify a group of objects.
A generic name ends with an asterisk (*). For example, ORD* identifies
all objects whose names begin with the characters ORD.
(2) In the hierarchical file
system, a path name that contains one or more wildcard
characters.
generic search
In the
OfficeVision program, a type of search that searches all documents or personal
directories authorized to a user for information that corresponds to a search
value that contains a string of characters followed by an asterisk. The
asterisk indicates to the system that the user wants to identify all instances
of the specified character string. See also contextual
search and exact search.
get
In
MQSeries message queuing, to retrieve a message by removing the message from a
queue or by browsing the message. See also
browse.
GET
See generic
envelope type (GET).
get function
In the OfficeVision
program, a function that inserts text from one document into another
document.
GFT
See grant functional
transmission (GFT).
gid
See group identification
number (gid).
GIF
See graphical
interchange format (GIF).
GIX
See generalized
interactive executive (GIX).
global directory agent (GDA)
A
Distributed Computing Environment (DCE) component that makes it possible for
the local CDS to access names in foreign
cells.
global mutex
A mutual exclusion
lock that is provided by the pthreads library to allow easy serialization to
application resources. See also mutex and
pthread.
global name
(1) In COBOL, a name that
is declared in only one program but that may be referred to from that program
and from any program contained within that program. Condition-names,
data-names, file-names, record-names, and some special registers may be global
names.
(2) A name that is universally
meaningful and usable from anywhere in the Distributed Computing Environment
(DCE) naming environment.
(3) In SystemView Managed System
Services/400, the name by which an object is known to SNA File Services
(SNA/FS). SNA/FS enables objects to be uniquely named in an SNA network
with systems of different types.
global polling
In Managed System
Services, a type of polling used by the topology manager when collecting
topology information for all the systems in the
network.
global server
In the DCE
Distributed Time Service (DTS), a server that provides its clock value to
courier servers on other cells, or to DTS entities that have failed to obtain
the specified number of servers locally.
global set
In the DCE Distributed
Time Service (DTS), the group of global servers in a
network.
global variable
A named entity
within query management that can be assigned a value used for communications
between an application program and Query
Management/400.
global variable pool
In query
management, the set of all user- and query-defined variables associated with a
query instance.
GLT
See group list table
(GLT).
glyph
A graphic symbol whose
appearance conveys information, for example, the vertical and horizontal
arrows on cursor keys that indicate the directions in which they control
cursor movement.
GMT
See Greenwich mean time
(GMT).
GOCA
See Graphic Object
Content Architecture (GOCA).
Gopher
In the Internet suite of
protocols, a distributed information service that makes available hierarchical
collections of information. A single Gopher client can access
information from any accessible Gopher server. The Gopher client
provides the user with a menu-driven
interface.
grade level
Pertaining to the
vocabulary understanding of a student of a particular
grade.
grade of delivery
In
OfficeVision, a specification for how fast a mail item will be sent.
The three grades of delivery are high, normal, and low. When the sender
assigns a high grade of delivery, the system delivers the mail item by the
fastest possible means.
grant functional transmission (GFT)
In MTAM, a
control character indicating that the host system gives permission to the
AS/400 system to send data or that the AS/400 system gives permission to the
host system to send data. Contrast with request functional
transmission.
graph
(1) See
chart.
(2) In Performance Tools, the
displayed, printed, or plotted output that represents the horizontal and
vertical axis variables specified by the user for a collection of performance
data.
graph format
In Performance
Tools, a template used to display performance and historical graphs.
The graph format consists of such things as titles, axis variables, and the
type of graph.
graphical data display manager (GDDM)
A
function of the operating system that processes both text and graphics for
output on a display, printer, or plotter. Contrast with
presentation graphics routines
(PGR).
graphical interchange format (GIF)
A digital
format that is used to compress and transfer graphical information over
computer networks. For example, GIF is a common format for graphical
information on the Internet.
graphical user interface (GUI)
A type
of user interface that takes advantage of high-resolution graphics. A
graphical user interface includes a combination of graphics, the object-action
relationship, the use of pointing devices, menu bars and other menus,
overlapping windows, and icons.
graphic character
A character
that can be displayed or printed. Contrast with control
character.
graphic character global identifier (GCGID)
A 4- to
8-character alphanumeric identifier assigned to a registered graphic
character. Each graphic character that is to be assigned a code point
must have a GCGID. Each GCGID is
unique.
graphic character set
A defined
set of graphic characters. No coded representation is
assumed.
graphic character set global identifier (GCSGID)
A number
between 00001 and 65534 that is assigned to identify a graphic character
set. For AS/400 business computing systems, the graphic character set
global identifier is expressed as a 5-digit decimal number. For
example, the invariant character set has the GCSGID of
00640.
graphic character-set ID
A
5-digit registered identifier used to specify a graphic character set.
The graphic character-set ID is the first part of the QCHRID system value or
the CHRID parameter value. See also code-page
ID.
graphic data type
A character
string in which each character is represented by 2 bytes. The character
string does not contain shift-in (SI) and shift-out (SO) characters.
Contrast with DBCS-only.
Graphic Object Content Architecture (GOCA)
An
architecture that provides a collection of graphics values and control
structures used to interchange and present graphics
data.
graphic push button
A button that
uses an image, rather than text, to describe its
use.
graphics
(1) Pictures and
illustrations.
(2) Pertaining to charts, tables,
and their creation. See also computer
graphics.
graphics data format (GDF)
In AFP
Utilities, the ability to create an AFP resource, such as an electronic
overlay.
graphics data format (GDF) file
A
picture definition in a coded order format used internally by the GDDM
function and, optionally, providing the user with a lower-level programming
interface than the GDDM application programming
interface.
graphics field
In the GDDM
function, that part of the display or the paper that is used for pictures and
graphics text.
graphics primitive
In the GDDM
function, a single item of graphics information, such as a line or a string of
graphics text.
graphics segment
In the GDDM
function, a group of graphics primitives (lines, arcs, and text) that are
operated as a common set. The graphics primitives inside a graphics
segment share characteristics, such as visibility and angle of rotation, but
keep their individual characteristics, such as color and line
width.
graphics symbol set
In the GDDM
function, an object that can contain either lines or images. The
system-recognized identifier for the object type is *GSS. See also
vector symbol set (VSS) and image symbol set
(ISS).
graphics text
In the GDDM
function, text displayed by an application program using a graphics symbol
set.
graphic string
A set of
characters associated with a double-byte character
set.
graphics window
In the GDDM
function, the view of the graphics picture that is defined by the range of the
world coordinates specified by the user.
gray level
In the GDDM function,
a digitally coded shade of gray that is in a range of 0 through 7. See
also gray-scale image.
gray scale
A scale that indicates
the shades of gray between black and white that can be presented on a display
device.
gray-scale image
In the GDDM
function, an image in which the degrees of shading between black and white are
represented by different gray levels. Each picture element of the image
has a value in the range from 0 through
7.
Greenwich mean time (GMT)
Mean
solar time at the meridian of Greenwich, England. GMT was formerly used
as the basis of standard time throughout the world. Universal Time
Coordinated is considered the most accurate measure of time. See also
Universal Time Coordinated (UTC).
grid
(1) In Business Graphics Utility
and the GDDM function, uniformly spaced horizontal and vertical lines on a
chart. See also axis grid lines.
(2) In AFP Utilities, horizontal and
vertical lines printed on an AFP resource, such as an electronic overlay, to
help in the design of the AFP resource.
group
(1) In the Application
Development Manager feature of the Application Development ToolSet licensed
program, a collection of parts at the same phase in the development
process.
(2) A collection of CICS resource
definitions that can be usefully exported together. A group normally
includes all the elements for an application.
(3) In DCE Remote Procedure Call
(RPC), a name service entry that corresponds to one or more RPC servers that
offer common RPC interfaces, RPC objects, or both. A group contains the
names of the server entries, other groups, or both that are members of the
group. See NSI group attribute.
(4) In DCE Security, data that
associates a named set of principals that can be granted common access
rights. See subject
identifier.
group address
In communications,
a multidestination address associated with one or more stations on a given
network. Contrast with individual
address.
group authority
Authority to use
objects, resources, or functions from a group
profile.
group calendar
A display that
shows the events for up to seven users at one
time.
Group Control System (GCS)
In OSI
Communications Subsystem, a VM operating environment in which the subsystem
and Virtual Telecommunications Access Method (VTAM)
run.
group data area
A data area that
is automatically created when an interactive job becomes a group job.
This data area is shared by all jobs in the group but cannot be used by jobs
outside the group.
group identification number (gid)
A four-byte,
unsigned integer (gid) used to identify a group profile. Contrast with
user identification number
(uid).
group indication
In RPG, the
printing of control information for only the first record of a group of
records containing identical control
information.
group item
In COBOL, a named set
of consecutive elementary or group items.
group job
One of up to sixteen
interactive jobs that are associated in a group with the same work station
device and user.
group job name
The name that
identifies a given job within a group.
group job transfer
An operation
performed by the Transfer to Group Job (TFRGRPJOB) command that will either
start a new group job or resume an existing group
job.
group list print descriptor
A
special type of print descriptor used to define print descriptor groups, and
the search order used when a print descriptor is referred
to.
group list table (GLT)
A CICS table
that identifies the library and file names for resource mapping that is to be
installed when the control region is
started.
group member
(1) A user profile that
is a member of a group profile.
(2) In DCE Remote Procedure
Call (RPC), a name service entry whose name occurs in the group.
(3) In DCE Security, a
principal whose name appears in a security group. See
group.
group message queue
A message
queue that is associated with a group of jobs. When the message queue
is set either to break mode or notify mode in the active group job, the mode
is the same for any job in the group that becomes the active
job.
group profile
A user profile that
provides the same authority to a group of
users.
group PTF
A single, orderable PTF
(program temporary fix or simply, fix) that provides a logical set of PTFs for
a specific function such as database, Java, or Y2K. Group PTFs are
dynamically updated when new PTFs for the same function become
available.
group window
In Client Access for
Windows, a window that contains one or more icons that represent applications,
functions, or documents. See also
group.
GUI
See graphical user
interface (GUI).
guideline value
In capacity
planning, a value used as a general guide for optimal resource
utilization. If resource utilization is above the guideline value, the
resource may be approaching a problem area or a threshold value.
Guideline values are also available for the rate of synchronous reads in the
machine pool and for the sum of all pools. Contrast with threshold
value.
GUI designer
The VRPG tool suite
that allows the user to create interfaces by dragging and dropping controls
from the parts palette to the design window.