Kuroyume - the G5 is a hybrid 32/64-bit processor (which is what I said earlier ;) ). The 64-bit functionality can be accessed by way of Cocoa. Carbon was built as only a compatibility library - nothing more (this explains why I rode CL/eF's arse for so long about re-writing Poser's codebase for it). That said, it is possible to do a pure 64-bit app on OSX, and has been for a long time. Ghonma - you are correct, save for the Itanium processor (ia_64), which is full 64-bit (and a raging pain in the ass to code for, not to mention expensive - which is why you only see it in certain lines of high-end server gear). /P