DDK Glossary - T

table tags

In Information Presentation Facility, a document element that formats text in an arrangement of rows and columns.

tag

(1) One or more characters attached to a set of data that contain information about the set, including its identification. (I) (A)

(2) In Generalized Markup Language markup, a name for a type of document or document element that is entered in the source document to identify it.

target object

An object to which the user is transferring information.

Task List

In the Presentation Manager, the list of programs that are active. The list can be used to switch to a program and to stop programs.

terminate-and-stay-resident (TSR)

Pertaining to an application that modifies an operating system interrupt vector to point to its own location (known as hooking an interrupt). Abbreviated as TSR.

text

Characters or symbols.

text cursor

A symbol displayed in an entry field that indicates where typed input will appear.

text window

Also known as the VIO window.

text-windowed application

The environment in which the operating system performs advanced-video input and output operations.

thread

The smallest unit of execution within a process, using the resources of the process.

thumb mark

The portion of the scroll bar that describes the range and properties of the data that is currently visible in a window. Also known as a slider box.

thunk

Term used to describe the process of address conversion, stack, and structure realignment that is necessary when passing control between 16-bit and 32-bit modules.

thunk layer

An interface that converts 32-bit parameters to 16-bit parameters, and maps linear addresses to segmented addresses.

tilde

A mark used to denote the character that is to be used as a mnemonic when selecting text items within a menu.

time slice

(1) The period of processing time allocated for running a program.

(2) An interval of time on the processing unit allocated for use in performing a task. After the interval has expired, processing unit time is allocated to another task, so a task cannot monopolize processing unit time beyond a fixed limit.

(3) In systems with time sharing, a segment of time allocated to a terminal job.

time-critical process

A process that must be performed within a specified time after an event has occurred.

timer

A facility provided under the Presentation Manager, whereby Presentation Manager will dispatch a message of class WM_TIMER to a particular window at specified intervals. This capability may be used by an application to perform a specific processing task at predetermined intervals, without the necessity for the application to explicitly keep track of the passage of time.

timer tick

See clock tick.

title bar

In SAA Advanced Common User Access architecture, the area at the top of each window that contains the window title and system menu icon. When appropriate, it also contains the minimize, maximize, and restore icons. Contrast with panel title.

transaction

An exchange between a workstation and another device that accomplishes a particular action or result.

transform

(1) The action of modifying a picture by scaling, shearing, reflecting, rotating, or translating.

(2) The object that performs or defines such a modification; also referred to as a transformation.

Translation lookaside buffer (TLB)

A hardware-based address caching mechanism for paging information. Abbreviated as TLB.

Tree

In the Presentation Manager, the window in the File Manager that shows the organization of drives and directories.

truncate

(1) To terminate a computational process in accordance with some rule. (A)

(2) To remove the beginning or ending elements of a string.

(3) To drop data that cannot be printed or displayed in the line width specified or available.

(4) To shorten a field or statement to a specified length.

tuple

In a relational database, a part of a relation that uniquely describes an entity and its attribute.