In the first two installments of this article, we looked first at Apple's proprietary programming environments for Mac OS X - Classic, Carbon, and Cocoa - and then at its cross-platform Unix layer

In the previous installment of this article we looked at three of the five breeds of programs that run in Mac OS X: Classic, Carbon, and Cocoa. Those three are most notable because they're used for the majority of current Mac OS X programs

As we discuss Apple's new operating system, there's a strong awareness that, no matter how good Mac OS X itself might be, it can't succeed without applications created outside Apple