You know all that one of the most exciting features of Delphi XE2 is the
MaxOSX Cross-Platform feature.
You've got the UI part,
that is FireMonkey, but underneath, you did have some RTL modifications in
order to let our Windows-centric solutions be OSX ready.
The first main step was to make our code speak with the "Objective-C" way of coding.
Objective-C is the primary language used for Apple's Cocoa API, and it was originally the main language on NeXT's NeXTSTEP OS. It's some object-oriented C variant, but something other than C++ or Java. In fact, Objective-C sounds more like a SmallTalk variance of C than another C++/Java/C# flavor. For instance, the Objective-C model of object-oriented programming is based on message passing to object instances: this is just another way of doing it. It has some advantages, and disadvantages (I don't want to troll here) - but it is definitively nice. And the memory model is just something else, more close to our reference-counting way (as in Delphi interface implementation) than a garbage collector.