User interface.

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

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.

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

See uniform resource locator.

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

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