Use default: Specifies whether this screen's askiaweb layout will be based on the *.QES file's default layout (options menu->internet options). If this option is not selected, the current screen's layout will be based on the values specified here in the buttons tab. You can choose which settings to override (e.g. the previous button), and leave the rest of them "as is". For details of the properties in this tab, see Buttons (Internet settings).