Glossary


U

UI
User interface.

unary message
A message that has no arguments. size is an example of a unary message.

uniform resource locator (URL)
A standard identifier for a resource on the World Wide Web, used by a Web browser to initiate a connection. The URL includes the communications protocol to use, the name of the server, and path information identifying the object to be retrieved on the server.

unload
A system operation that removes a software component from an image by unlinking it.

URL
See uniform resource locator.

user interface (UI)
The hardware, software, or both that enables a user to interact with a computer. In VisualAge, user interface normally refers to the visual presentation with which a user interacts and its underlying software.

user object
A system component that represents a person who can use a library. See also system component.


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