Appendix G: Glossary of Terms
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Auto time

Automatically inserts the current time into the survey.

Auto date

Automatically inserts the current date into the survey.

Database connector attribute

A value used to represent the 'many' end of a 'one-to-many' relationship.

DBMS

Database Management System.

DLL

Dynamically Linked Library. These are special types of executable file that are often shared by other executable programs. There are not loaded into memory until they are specifically required.

Drive

In DOS a drive is a distinct device used for the persistent storage of files. Drives are referred to by a letter followed by a colon. Certain letters are reserved for particular drive types - a: and b: always refers to floppy disk drives. Drive C: is usually the first hard disk drive.

Folder

A special file that can contain any other type of file. Folders are used to group other files in an organised way.

Folders can contain other directories which are then referred to as sub-directories.

Double click

Pressing the mouse left button twice in rapid succession.

Entity

A topic, task, object or event of interest to the working of an organisation and about which information is kept.

An entity is the equivalent of an entry (or row) in a table of such information.

ERA diagram

Entity-relationship-attribute diagram.

Filenames

Filenames comprise of two parts: a name and an extension. The name is separated from the extension by a dot, e.g. "POKETSURVEY DESIGNER.EXE"

Files

All objects that can be stored on a disk are known as files and are referred to by their filenames. There are three main types of file:

executable: these are characterised by having the extension exe or dll

data: these contain information that is used or created by executable files and may have any extension. Some common extensions are .CSV, .TXT.

folders: these are special files that can contain other files.

Windows Explorer

A program supplied with Microsoft Windows that enables users to perform various actions on files.

Input time

prompts the user for the time.

Input date

prompts the user for the date.

Key attribute

A value used to identify a member of a set. Usually the elements of the set are records, in which one of the fields holds the key.

Normal form

A term applied to relations in a relational database. A relation is said to be in normal form if it satisfies certain defined constraints originally proposed by E. F. Codd.

The purpose of any normal form is to avoid inefficiencies and anomalies that would otherwise occur during updating.

Path (see Folder)

In DOS this is the course of directories that leads to the files you wish to use.

Port

A connection point with associated control circuitry that allows I/O devices to be connected to the internal bus of a microprocessor

Real

A numerical type that may have a fractional part, e.g. 1.234, -3.5, 0.625, etc.

Relational model

A model that permits the definition of:

The model is based on the mathematical concept of the relation and is often expressed in terms of a set of normal forms. It is used exclusively in the context of DBMSs.

Serial interface

A connection point through which data is transferred one bit at a time. Compare with parallel interface.

Spreadsheet

A program that manipulates tables consisting of rows and columns of cells.

String

A sequence of characters

Sub-folder

A folder contained within an existing folder. Sub-folders are a recursive structure and can, in turn, contain other sub-folders. This can continue to any depth.

System folder

This is the folder where the PocketSurvey program files are kept.

Toggle

A logical switch that has two distinct states. Each time the switch is activated, the state changes from its previous one. For example you can toggle the handheld simulator on or off.

Working folder

This is the folder where you save your questionnaire designs.

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