Interapplication Programming
Cocoa applications can communicate with each other in several ways. The lowest levels of the Mac OS X kernel provide interapplication communication features. Deep within the implementation of the operating system, processes communicate using Mach messages and Mach ports. Just above the kernel level, Mac OS X provides standard BSD Unix sockets. Sockets are a cross-platform API for interprocess and network communications. Services such as the Message framework and Directory Services described in this chapter are implemented using Mach messages and/or sockets.
Mac OS X provides several high-level, interapplication communication APIs that are based on sockets and Mach messages, but shield programmers from low-level implementation ...
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