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Leopard 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 a cached response to a URL load request.
2008-05-02
NSHost Class Reference (HTML) (PDF)
Describes a representation of a network host.
2007-03-24
NSHTTPCookie Class Reference (HTML) (PDF)
Describes an opaque set of data that represents state or configuration.
2008-11-13
NSHTTPCookieStorage Class Reference (HTML) (PDF)
Describes a collection of cookies shared across all applications.
2006-05-23
NSHTTPURLResponse Class Reference (HTML) (PDF)
Describes a response to an HTTP request.
2006-05-23
NSInputStream Class Reference (HTML) (PDF)
Describes a read-only data stream.
2007-04-05
NSMessagePort Class Reference (HTML) (PDF)
Describes an endpoint for distributed object connections or interprocess messaging.
2006-05-23
NSMessagePortNameServer Class Reference (HTML) (PDF)
Describes a facility that accepts and returns message ports.
2007-02-23
NSMutableURLRequest Class Reference (HTML) (PDF)
Describes a mutable request for a resource identified by a URL.
2006-05-23
NSNetService Class Reference (HTML) (PDF)
Describes a network service that an application publishes or uses as a client.
2009-04-08
NSNetServiceBrowser Class Reference (HTML) (PDF)
Describes a query for published network services.
2009-04-08
NSOutputStream Class Reference (HTML) (PDF)
Describes a write-only data stream.
2009-01-06
NSSocketPort Class Reference (HTML) (PDF)
Describes a BSD socket for distributed object connections or raw messaging.
2008-10-15
NSSocketPortNameServer Class Reference (HTML) (PDF)
Describes a registrar of named TCP/IP sockets.
2007-02-26
NSStream Class Reference (HTML) (PDF)
Describes an interface for reading and writing data.
2008-10-15
NSURL Additions Reference (HTML) (PDF)
Describes additions to support pasteboards.
2006-05-23
NSURL Class Reference (HTML) (PDF)
Describes a string that uniquely identifies a resource.
2009-02-04
NSURLAuthenticationChallenge Class Reference (HTML) (PDF)
Describes a challenge from a server requiring authentication from the client.
2006-05-23
NSURLAuthenticationChallengeSender Protocol Reference (HTML) (PDF)
Describes the interface for receiving authentication challenges.
2006-05-23
NSURLCache Class Reference (HTML) (PDF)
Describes a collection of cached responses and data.
2008-03-11
NSURLClient Protocol Reference (HTML) (PDF)
Deprecated - Describes the deprecated class replaced by the classes NSURLConnection and NSURLDownload.
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 a credential used to authenticate a URL load request.
2006-06-28
NSURLCredentialStorage Class Reference (HTML) (PDF)
Describes a mapping of credentials to their corresponding protection spaces.
2006-05-23
NSURLDownload Class Reference (HTML) (PDF)
Describes a connection used to download data to a file.
2006-05-23
NSURLHandle Class Reference (HTML) (PDF)
Describes a deprecated technology replaced by the NSURLDownload class.
2009-02-04
NSURLHandleClient Protocol Reference (HTML) (PDF)
Describes a deprecated technology replaced by the NSURLDownload class.
2006-05-23
NSURLProtectionSpace Class Reference (HTML) (PDF)
Describes an area on a server that requires authentication of URL load requests.
2006-05-23
NSURLProtocol Class Reference (HTML) (PDF)
Describes the interface for protocol-specific loading of URL data.
2007-04-01
NSURLProtocolClient Protocol Reference (HTML) (PDF)
Describes the interface used by protocol objects to communicate with the URL loading system.
2006-05-23
NSURLRequest Class Reference (HTML) (PDF)
Describes a request for a resource identified by a URL.
2007-04-01
NSURLResponse Class Reference (HTML) (PDF)
Describes the metadata returned by a server for a load request.
2007-12-11