Summary
Cocoa provides powerful interapplication programming and network communication features. In most cases, detailed knowledge of network protocols and operating system details are not required to create applications that download data or communicate with other applications. Cocoa provides extensible access to directory services, and the Message framework provides the NSMailDelivery class for communicating with the operating system’s built in email-delivery features.
Chapter 24, “Subprocesses and Threads,” covers the Cocoa classes that encapsulate operating system tasks and threads. Each application running on Mac OS X consists of one task and each task has at least one thread. Applications can start other tasks, send data to the tasks, ...
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