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Reference: Cocoa
Networking capabilities in Mac OS X include support for the major protocols and services. Developers can use the networking APIs to provide sophisticated LAN, WAN, Internet, and web capabilities in Cocoa applications. These are accessible through sockets and Core Foundation, as well as through the higher-level Cocoa APIs.

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CBGroupIdentity Class Reference (HTML) (PDF)
Describes the class for operating on user identities.
2007-05-14
CBIdentity Class Reference (HTML) (PDF)
Describes the class used to create and operate on identities.
2007-05-14
CBIdentityAuthority Class Reference (HTML) (PDF)
Describes the class used to manipulate identity authority databases.
2007-05-14
CBIdentityPicker Class Reference (HTML) (PDF)
Describes the class that manages the identity picker.
2007-05-14
CBUserIdentity Class Reference (HTML) (PDF)
Describes the class for operating on user identities.
2007-05-14
Collaboration Framework Reference (HTML) (PDF)
Describes the Objective-C API for monitoring and editing identities.
2007-05-14
Identity Services Reference Collection (HTML) (PDF)
Describes the APIs for using identities and the Identity Picker.
2007-05-14
NSCachedURLResponse Class Reference (HTML) (PDF)
Describes the class that encapsulates cached data and the server response for a URL load request.
2006-06-28
NSHost Class Reference (HTML) (PDF)
Describes the class used to get information about a network resource.
2007-03-24
NSHTTPCookie Class Reference (HTML) (PDF)
Describes the class that encapsulates an HTTP cookie.
2006-05-23
NSHTTPCookieStorage Class Reference (HTML) (PDF)
Describes the class that manages the shared HTTP cookie storage.
2006-05-23
NSHTTPURLResponse Class Reference (HTML) (PDF)
Describes the class that encapsulates a response to an HTTP URL load request.
2006-05-23
NSInputStream Class Reference (HTML) (PDF)
Describes the class that implements a read-only stream.
2007-04-05
NSMessagePort Class Reference (HTML) (PDF)
Describes the class whose instances are endpoints in local communication through distributed objects or raw messaging.
2006-05-23
NSMessagePortNameServer Class Reference (HTML) (PDF)
Describes the class for taking and returning instances of NSMessagePort.
2007-02-23
NSMutableURLRequest Class Reference (HTML) (PDF)
Describes the class that encapsulates a mutable URL load request.
2006-05-23
NSNetService Class Reference (HTML) (PDF)
Describes the class used to publish or consume a network service using multicast DNS.
2008-02-08
NSNetServiceBrowser Class Reference (HTML) (PDF)
Describes the class used to find published services on a network using multicast DNS.
2007-04-02
NSOutputStream Class Reference (HTML) (PDF)
Describes the class that implements a write-only stream.
2007-04-05
NSSocketPort Class Reference (HTML) (PDF)
Describes the class whose instances are used as socket endpoints for distributed object connections or raw messaging.
2007-01-30
NSSocketPortNameServer Class Reference (HTML) (PDF)
Describes the class for taking and returning instances of NSSocketPort.
2007-02-26
NSStream Class Reference (HTML) (PDF)
Describes the class for reading and writing data to and from memory, files, and network sockets in a device-independent way.
2007-07-23
NSURL Additions Reference (HTML) (PDF)
Describes the category that extends the NSURL class by adding support for pasteboards.
2006-05-23
NSURL Class Reference (HTML) (PDF)
Describes the class that encapsulates a URL.
2007-02-23
NSURLAuthenticationChallenge Class Reference (HTML) (PDF)
Describes the class that encapsulates a challenge received from a server requiring authentication in response to a URL load request.
2006-05-23
NSURLAuthenticationChallengeSender Protocol Reference (HTML) (PDF)
Describes the protocol that the sender of an authentication challenge must implement.
2006-05-23
NSURLCache Class Reference (HTML) (PDF)
Describes the class that manages cached responses and data from URL load requests.
2008-03-11
NSURLClient Protocol Reference (HTML) (PDF)
Deprecated - Deprecated. Describes the informal protocol implemented by clients of an NSURLHandle download.
2006-08-01
NSURLConnection Class Reference (HTML) (PDF)
Describes the class that provides support for retrieving data from a server in response to a URL load request.
2007-04-01
NSURLCredential Class Reference (HTML) (PDF)
Describes the class that encapsulates an authentication credential used with a URL load request.
2006-06-28
NSURLCredentialStorage Class Reference (HTML) (PDF)
Describes the class that manages credential storage for URL load requests.
2006-05-23
NSURLDownload Class Reference (HTML) (PDF)
Describes the class that provides support for downloading data from a server to a file for a URL load request.
2006-05-23
NSURLHandle Class Reference (HTML) (PDF)
Deprecated. Describes the class that provides support for downloading data from a URL.
2006-06-28
NSURLHandleClient Protocol Reference (HTML) (PDF)
Deprecated. Defines the protocol that must be implemented by clients of NSURLHandle.
2006-05-23
NSURLProtectionSpace Class Reference (HTML) (PDF)
Describes the class that encapsulates an area on a server that requires authentication for a URL load request.
2006-05-23
NSURLProtocol Class Reference (HTML) (PDF)
Describes the abstract class that is used by subclasses that provide custom protocol-specific loading of URL data.
2007-04-01
NSURLProtocolClient Protocol Reference (HTML) (PDF)
Describes the protocol used by NSURLProtocol subclasses to communicate with the URL loading system.
2006-05-23
NSURLRequest Class Reference (HTML) (PDF)
Describes the class that encapsulates a URL load request.
2007-04-01
NSURLResponse Class Reference (HTML) (PDF)
Describes the class that encapsulates the response from a server to a URL load request.
2007-12-11