Enumerations, lists or character name arrays

• DisplayEye lists the different locations for the viewers eye: NOSTEREO if the display is not in stereo, LEFTEYE or RIGHTEYE if the view from either eye is being used.
• Buttons lists the different input buttons which are assumed to be available. B_LEFT, B_MIDDLE, and B_RIGHT are for the three buttons on a mouse, while B_F1 through B_F12 are for 12 function keys, and B_ESC is for the `esc' key of the keyboard.
• EventCodes lists the different types of window events which are assume to be possible. These are all prefixed with `WIN_', and include redraw, mouse and keyboard button events, as well as events for when mouse focus changes or the window is exposed.