Adapting a Display Management Process for Windowing
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
This article describes how to take an existing display interface with existing applications and adapt it for windowing without modifying the application. The method is described with reference to the IBM Graphic Data Display Manager (GDDM). An application program initiates a session with GDDM and constructs data to be displayed in a GDDM device. GDDM is required to run many such applications on windows of a single physical device without modifying the application program. The solution to the problem is as follows. GDDM is functionally extended as follows: -There will be a new object on a GDDM device, called a window. - At any one time, one, and only one, window will be assigned the special status of candidate window.