use on HP's
see manual

useful:
------
extral loadable functions in /export/src/master/elk-1.3/scm
apropos oops describe setf trace debug ...

(pp ...)                ; pretty print object
(describe ...)          ; describe object
  
debugging:
---------- 
  (load "trace")
  (trace function)             ; trace function
  (function . args)
  (untrace function)

  (macro-expand '(macro . args))


autoloadable graphics:
----------------------
(require 'xt)

(require 'xwidgets)
(load-widgets [widjet names])

xlib basics:
------------
(create-window
   'parent
   'width
   'height
   'background-pixel
   'event-mask '(exposure button-press enter-window leave-window))

(handle-events display #t #f     ;must have defined event mask first
  (else ...)
  (expose ...)
  (button-press ...)
  (enter-notify ...)
  (leave-notify ...)

(close-display display)
