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Release Notes
Darwin is the UNIX technology-based foundation of Mac OS X. Darwin integrates several technologies. Among the most important are 4.4BSD-based operating-system services (built on the Mach 3.0 microkernel), the I/O Kit, networking facilities, and support for multiple integrated file systems. Developers can use Darwin to port UNIX/Linux applications and create kernel extensions.
A guided introduction and learning path for developers new to Darwin.   Essential information for developers working in the Darwin environment.   C and Objective-C API references organized by framework.
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Affinity API Release Notes for Mac OS X v10.5 (HTML)
Explains how to influence which CPU core runs a group of threads (for performance optimization).
 Performance, Process Management 2007-10-31
CCL Modem Scripting Release Notes (HTML)
Explains changes to modem CCLs for Mac OS X v10.5 and what to do to change existing and supersede older scripts.
 Hardware & Drivers, Networking 2007-10-31
Code Signing Release Notes (HTML)
Security 2007-10-31
I/O Kit Power Management Release Notes (HTML)
Describes the latest changes to power management for Mac OS X v10.5.
 Hardware & Drivers 2007-10-31
Kernel Extensions Release Notes (HTML)
Kernel 2007-10-31
Perl, Python, and Ruby Extensions Release Notes (HTML)
Describes how to create universal binary extensions for Perl, Python, and Ruby.
 Porting, Tools 2007-10-31
Symbol Variants Release Notes (HTML)
Describes symbol variants, a way of providing multiple versions of symbols for backwards compatibility.
 Porting, Tools 2007-10-16
Unix 03 Conformance Release Notes (HTML)
Describes features, issues, and workarounds related to Mac OS X v10.5 and its support of SUSv3 (Version 3 of the SUS).
 General 2006-10-06