A small pictorial representation of an object.

A VA Smalltalk Part that implements behavior and a public interface for an icon. Icon gadgets can be created only from within a container part.

A Smalltalk file that provides a development environment on an individual workstation. An image contains object instances, classes, and methods. It must be loaded into the Smalltalk virtual machine in order to run.

Access controls that protect the integrity of major system components. For example, such controls can bind the ownership of an image to a specific user with password protection. See also application controls.

A Smalltalk object whose value is represented directly in the object pointer, with no data associated. Examples are true, false, and nil.

For any given message selector, a method that implements that selector.

A variable that is referred to by an index number. An indexed variable contains a reference to a Smalltalk object.

A relationship among classes in which one class shares the structure and behavior of another. A subclass inherits from a superclass.

A Smalltalk command that opens an Inspector window on the result of executed code. The window shows additional information about the result.

A Smalltalk tool for viewing the data of any Smalltalk object.

An object that is a single occurrence of a particular class. An instance exists in memory or external media in persistent form. Compare to persistent object.

In Smalltalk, a method that provides behavior for particular instances of a class. Messages that invoke instance methods are sent to particular instances, rather than to the class as a whole. Contrast with class method.

Private data that belongs to an instance of a class and is hidden from direct access by all other objects. Instance variables can be accessed only by the instance methods of the defining class and its subclasses.

In Java, an aggregate specification of one or more methods. Interfaces differ from classes in that they do not encapsulate data or define method implementations. Like classes, they follow standard rules of inheritance and can be used as types. A class is said to have implemented a specific interface when it implements all methods specified by the interface and states its support in its class declaration.

In VA Smalltalk, the software used together with the RecordStructure classes to convert existing C or COBOL definitions into Smalltalk objects.

A high-performance interface for running programs on a Web server. ICAPI is an alternative to CGI for servers running the IBM Internet Connection Server software.

A high-performance interface for running programs on a Web server. ISAPI is an alternative to CGI for servers running the Microsoft Windows software.

Having its (a process's) rate of progress limited by the speed of input/output devices, such as CD-ROM drives or hard disks.

A software development process that enables progress in stages. At the end of each stage, the result is verified by end users. Through such verification, requirements are dynamically identified and refined while the product is under development.