The screen/messages display data base 852 contains the following components: (1) the `text locator number` 853 which is the screen number; (2) the `text format control` 854 which is information, such as row and column numbers, needed to correctly place prompts/messages/directives on the visual display output means 15 (FIG. 2), (3) the `text to be displayed` 855 is the screen information to be outp