Abstract: Symbols of a plurality of page turning buttons and one guide display button are displayed on a screen of a computer system. A page turning apparatus for use with a computer system has a screen data table that stores information of page turning buttons for individual pages to be turned and information of pages displayed by the page turning buttons. When one of the page turning buttons is selected by an input unit such as a mouse, the page turning apparatus obtains page information corresponding to the selected page turning button from the screen data table and replaces the current screen page of the computer system with a page corresponding to the obtained page information. In addition, the page turning apparatus has a screen page hierarchical data table corresponding to functions of pages that can be displayed.

Abstract: This invention relates to a modulating controller for controlling two operation terminals, and more particularly to a device to suppress disturbance to a process when a control signal is switched or when a bias is set. This invention, in a modulating controller to control a process amount by the total of two operation terminals disposed in parallel, when either of two H/A station devices outputs a manual operation value, provides a device which outputs a value obtained by reducing the manual operation value from the control amount of the process amount to be controlled by the total of two operation terminals as the control operation signal to the other H/A station device and prepares a value almost same with the operation terminal control signal outputted by one H/A station device as the control operation signal for one H/A station device.