XView

The XView Window Toolkit provides an implementation of the OPEN LOOK Graphical User Interface (GUI) specification. It provides a migration path for SunView^TM applications.

XView uses variable-length attribute-value lists based on varargs to specify objects to be created, such as windows, menus, and scrollbars. This eliminates most of the boilerplate software usually found in procedural interfaces, since the usual behavior is already defined.