Whatever is not nailed down is mine.  What I can pry
loose is not nailed down.  - Collis P. Huntingdon

Concept 3.2 : Specifying a Color in Color-Index Mode
=====================================================

Idea:
=====
In color-index mode, use the glIndex*() command
to select a single value color index as the
current color index.  Again the first suffix
for this data type indicates the data type for
parameters: short, integer, float, double or 
unsigned byte.  Previously we saw the command
glClearColor() before specifying the color.A
similar command exists for the Color-Index mode.
This is the glClearIndex() command as you might
have guessed.  This command sets the current
clearing color in color-index mode.