The menu window (bottom right in Figure 1) represents the layout of the left side of the keyboard. A menu entry is selected by hitting the corresponding key in any of the 3 display windows or pointing to the entry with the mouse and clicking the left button. The space bar or middle mouse button will pop back one level in the menu. In the remainder of this document the following convention will be used to refer to menu selection: View/Reset means select the view menu, then select the reset button from within the view menu. Whenever text must be typed, such as in prompts for filenames, size and width parameters, etc., the mouse must be moved to the text entry window and the values typed, followed by the return key. Some menu items cannot be selected by the mouse because the mouse must be used to point to the object of the action, usually one of the 3 volume slices. In these cases, the mouse must be positioned on the relevant slice and the keyboard character corresponding to the menu entry pressed. When the user is prompted to type in a colour, either the name of a colour, such as red, yellow, or pink, or a numerical colour, such as 0.3 0.7 0.7 may be typed in. The following is a brief description of most useful menu items. Much of the menu is devoted towards the author's research and is therefore not applicable to the average user, and is not described herein.