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Leopard Release Notes
Networking capabilities in Mac OS X include support for the major protocols and services. Developers can gain access to them through sockets and Core Services, as well as through the higher-level Carbon and Cocoa APIs.

Provides a guided introduction to developing network-capable applications for Mac OS X.   Essential information for developers using Apple's networking environment.   API references organized by framework.
Networking Topics
C APIs for adding networking features to Carbon applications.   Objective-C APIs that support networking features in Cocoa applications.   Low-level open source networking and communication technologies.

Resources for developing network devices and software to access them.   Protocols and services that support networking for server-related products.   Programming interfaces for secure communication over a network.