REAL Software today publishes a white paper: What’s the difference
between Carbon and Cocoa, and why should I care?.

Many people are confused by references to Carbon and Cocoa. Geoff
Perlman explains what they are, what impact they have on you as a Mac
user, and what that means to users of REALbasic.

Check it out!

(http://www.realsoftware.com/realbasic/about/Carbon_vs_Cocoa.html)