Programmatically toggle display to white on black

FROM : Philip Dow
DATE : Sat Jun 24 19:53:42 2006

Is anyone aware of a way to switch the display into white on black 
mode then eventually back? This is a feature available via Universal 
Access that I would like to use programatically.

I've searched through the CGDisplay docs, Quartz stuff, NSScreen, -
Display and -ColorSpace but haven't found anything. Cocoadev doesn't 
seem to have anything on the topic and the Apple lists only produced 
an unanswered request from 2003.

I'd be fine with sending a command-alt-ctrl-8 keyboard shortcut event 
to the system, but I don't know how to do this either.

-Phil