How Mac OS X executes Apps
Well written article that describes what is happening when you execute an application on your Mac.
"In OS X, all files containing executable code, e.g., applications, frameworks, libraries, kernel extensions etc., are implemented as Mach-O files. Mach-O is a file format and an ABI (Application Binary Interface) that describes how an executable is to be loaded and run by the kernel. To be more specific, it tells the OS:" 0xFE - 11111110b - 0376 - 254 - b9
(Submitted by Noel Tue Mar 28, 2006 )
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