Moving the mouse on the reflective pad moves the cursor anywhere on the screen
including the menu area, the icons, and the image area. The mouse has three
buttons, which are designated 
(the left hand key); 
(the centre key); and 
(the right hand key). is used
to select a function or to perform an operation; is only used
in those instances where two functions can be performed from a single menu
option (such as increasing or decreasing the contrast); and is
used to return to the menu from an option, or to return to the main menu
from another menu.