NAVIGATION USING THE KEYBOARD: Your browser may enable you to use the tab and arrow keys to highlight icons and links on each page. Press the return key to select your choice. Use the backspace key to move back a page. Depending on your browser setup you may need to click the screen first.

CHANGING THE SIZE OF FONTS: In Internet Explorer™, use the Tools >> Internet Options menu and click on Accessibility on the General tab. Here a home page will permit you to use your own style sheet and to use your default screen settings. This will also let you change font size with the View >> Text Size menu option.

In Netscape 6™, use View >> Text size or View >> Style Sheet to customise your viewing options.

INTERACTIONS: All the interactions can be operated using a keyboard. Use the tab and arrow keys to select each clickable part in turn. They will become highlighted with a yellow box. Press the enter key to select your choice. Some interactions have letters or numbers displayed on screen, press these to make choices quickly. "Drag and Drop" exercises can be operated by keyboard using 'Mousekeys,' available under the accessibility options of your operating system.