Maxima keywords



Hello,

is there an easy way to get a list of all words, which Maxima recognizes or
uses for its own purposes?
As I understand, Maxima keywords are automatically converted to upper-case,
for example

sin+sinc => SIN+sinc after evaluation.

What I need is a command / function, which returns a list of all registered
keywords: [ABSBOXCHAR,ACOS,ACOSH,ACOT,...].
(I could get most of them from the manual index, but some packages - for
example 'Format' - define their own keywords).

I am planning to implement a simple 'syntax-highlighting' mechanism in
Symaxx.

Regards

Markus