Determining the running kernel mode on 10.6
Posted Mar 6, 2010
It might be useful in some cases to know if the MacOS kernel is running in the 32-bit or 64-bit (K64) mode. This is useful for example if you write an application like ‘System Profiler’ that displays the details of the currently running system:
Intel 64-bit summary
Posted Jan 8, 2010
Since people are confused regarding Intel 64-bit, here is a brief summary of what can run on which Intel processor.