Our requirement is to code in Carbon using Xcode and must be compatible in both versions of MAC OS X./8.6/9. is that possible ? we are quite new to the mac environment. so it would be greatful if anyone could suggest some suggestions... also there are certain doubts regarding.. 1. Hardware Interface How can we overcome this two different architectural device driver problem? Is carbon providing any APIs to work across different OS versions 2.While running over 68K processor there are lot of obsolete managers like Trap Manager, Trap Table, Mixed Mode Manager and Patch Manager, what are they? Do we really need them? If so as per your comments MAC OS X doesnt support them, then what are the available options? 3.Can we use C++ along with Carbon? 4.Which compiler you prefer to compile the application? 5.Is it possible for us to going a native calls i.e. BSD/POSIX APIs while taking into consideration that the underlying kernel is a UNIX variant? If so what are the limitations? Thanking You, rG.