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Leopard Release Notes
Apple provides information hardware developers can use to create products that are compatible with Macintosh computers and programming interfaces software developers can use to create software that drives or accesses devices.

A guided learning path for hardware and driver developers new to Mac OS X.   Essential information for developing drivers and device-access software.   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 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.
Networking, Serial, USB 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.
General, Performance 2007-10-31