Carbon.

[Rodney Sparapani]

Rodney Sparapani wrote:
> Hi Skip:
> 
> There is a very brief discussion of that at
> http://emacs-app.sourceforge.net/
> 
> For example:
> 
> On the Mac, this port differs from "Carbon" ports 
> <http://www.google.com/search?hl=en&lr=&rls=en&q=Carbon+Emacs&btnG=Search> 
> of GNU Emacs in that it makes a more concerted attempt from the ground 
> up to follow OS X desktop and UI conventions (without, however, limiting 
> in any way what you can already do with Emacs). In addition, it runs on 
> non-Mac platforms via the free GNUstep <http://gnustep.org> 
> implementation of OS X's Cocoa APIs.
> 
> Rodney

Oh, I forgot to mention one of the detractions of this API: it is 
Objective-C (ObjC) rather than C.  Now ObjC is contained in GCC which 
makes it more widely available, but it is still something extra to learn :0(