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Leopard Reference Library
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.
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CFNetwork Programming Guide (HTML) (PDF)
Explains how to use Core Foundation networking functions to work with low-level BSD sockets.
Core Foundation, General, Security Guides 2009-05-06
Stream Programming Guide for Cocoa (HTML) (PDF)
Explains how to use the Cocoa stream classes to read data from and write data to streams.
Cocoa Guides 2009-05-06
NSNetService Class Reference (HTML) (PDF)
Describes a network service that an application publishes or uses as a client.
Cocoa Reference 2009-04-08
NSNetServiceBrowser Class Reference (HTML) (PDF)
Describes a query for published network services.
Cocoa Reference 2009-04-08
Network Kernel Extensions Programming Guide (HTML) (PDF)
Describes how to write a kernel extension for adding or modifying functionality of a networking stack (Mac OS X 10.4 and later).
Darwin, Hardware & Drivers Guides 2009-03-02
Extending and Troubleshooting Directory Services (HTML)
Explains how to extend Directory Services for Mac OS X Server v10.5 and how to troubleshoot problems.
Mac OS X Server Release Notes 2009-02-04
NSURL Class Reference (HTML) (PDF)
Describes a string that uniquely identifies a resource.
Cocoa Reference 2009-02-04
NSURLHandle Class Reference (HTML) (PDF)
Describes a deprecated technology replaced by the NSURLDownload class.
Cocoa Reference 2009-02-04
NSOutputStream Class Reference (HTML) (PDF)
Describes a write-only data stream.
Cocoa Reference 2009-01-06
Safari User Guide for Web Developers (HTML) (PDF)
Describes the developer tools built into Safari for analyzing, testing, and debugging HTML, JavaScript, style sheets, and DOM structure.
Internet & Web Guides 2009-01-06
Web Services Core Programming Guide (HTML) (PDF)
Explains how to use the new Web Services client-side frameworks available in Mac OS X.
Internet & Web Guides 2009-01-06
Code Signing Guide (HTML) (PDF)
Explains how you can sign your code and why you should.
Security Guides 2008-11-19
NSHTTPCookie Class Reference (HTML) (PDF)
Describes an opaque set of data that represents state or configuration.
Cocoa Reference 2008-11-13
Kernel Core Dumps (HTML)
TN2118: Explains how to gather and use remote kernel core dumps.
Hardware & Drivers Technical Notes 2008-11-12
CFNetwork Error Codes Reference (HTML) (PDF)
Describes error codes used by the CFNetwork API.
Core Foundation Reference 2008-10-15
DNS Service Discovery Java Reference (HTML)
Describes DNS Service Discovery API features of ZeroConf networking for Java on Mac OS X in Javadoc format.
Bonjour Reference 2008-10-15
Identity Services Programming Guide (HTML) (PDF)
Explains how identities work and how to use them in applications.
Core Foundation, Security Guides 2008-10-15
NSNetServices and CFNetServices Programming Guide (HTML) (PDF)
Describes how to implement Bonjour in Cocoa or Carbon applications.
Bonjour, Cocoa Guides 2008-10-15
NSSocketPort Class Reference (HTML) (PDF)
Describes a BSD socket for distributed object connections or raw messaging.
Cocoa Reference 2008-10-15
NSStream Class Reference (HTML) (PDF)
Describes an interface for reading and writing data.
Cocoa Reference 2008-10-15
Security Overview (HTML) (PDF)
An introduction to computer security concepts and the security APIs in Mac OS X and iPhone OS.
Security Guides 2008-10-15
Generating a Non-Maskable Interrupt (NMI) (HTML) (日本語 HTML)
QA1264: Explains how to generate a non-maskable interrupt (NMI) on modern Macintosh systems.
Hardware & Drivers Technical Q&As 2008-10-13
Retain Counts of io_object_t Objects in IOKit.framework (HTML) (日本語 HTML)
QA1195: Distinguishes between the retain counts of an I/O Kit kernel object and its io_object_t user space proxy.
Printing Technical Q&As 2008-09-24
IODeviceTree and the I/O Registry (HTML) (日本語 HTML)
QA1120: Describes the IODeviceTree plane in the Mac OS X I/O Registry.
Hardware & Drivers Technical Q&As 2008-09-18
PortMapper (HTML) (DMG) (ZIP)
Demonstrates Bonjour's NAT port-mapping API, and provides a higher-level Objective-C interface to it.
Bonjour Sample Code 2008-07-25
CFNetwork Reference Collection (HTML) (PDF)
Describes the C APIs for performing a variety network tasks.
Carbon, General Reference 2008-07-15
CFFTPStream Reference (HTML) (PDF)
Describes the C API for communicating with FTP servers.
Core Foundation Reference 2008-07-11
CFHost Reference (HTML) (PDF)
Describes the C API for acquiring host information.
Core Foundation Reference 2008-07-11
CFHTTPMessage Reference (HTML) (PDF)
Describes the C API for creating, sending, receiving and manipulating HTTP messages.
Core Foundation Reference 2008-07-11
CFNetDiagnostics Reference (HTML) (PDF)
Describes the C API for diagnosing and fixing network related problems.
Core Foundation Reference 2008-07-11
CFHTTPStream Reference (HTML) (PDF)
Describes the interface for working with HTTP connections.
Core Foundation Reference 2008-07-08
CFNetServices Reference (HTML) (PDF)
Describes the C API for implementing Bonjour functionality in an application.
Core Foundation Reference 2008-07-08
CFStream Socket Additions (HTML) (PDF)
Describes the C API for using streams with sockets.
Core Foundation Reference 2008-07-08
CFProxySupport Reference (HTML) (PDF)
Describes the CFProxySupport API, which provides functions for managing network proxy information.
Core Foundation Reference 2008-07-07
Mac OS X Security Configuration Guide (PDF)
Describes how to configure Mac OS X to enhance security.
Security Guides 2008-06-09
Mac OS X Server Network Services Administration (PDF)
Explains how to set up, configure, and administer DHCP, DNS, VPN, NTP, IP firewall, and NAT services on the server.
Mac OS X Server Guides 2008-06-09
Mac OS X Server Podcast Producer Workflow Tutorial (PDF)
Explains how to develop and customize Podcast Producer workflows.
Mac OS X Server Guides 2008-06-09
Mac OS X Server Security Configuration Guide (PDF)
Describes how to configure Mac OS X Server to enhance server and service security.
Mac OS X Server, Security Guides 2008-06-09
URL CacheInfo (HTML) (DMG) (ZIP)
Demonstrates resource caching behavior using the Cocoa URL loading system.
Cocoa, Internet & Web Sample Code 2008-06-05
Kerberos GSS (HTML) (DMG) (ZIP)
Kerberos GSS-API Sample
Security Sample Code 2008-06-04
Getting a Packet Trace (HTML) (日本語 HTML)
QA1176: Lists tools available for looking at the network packets on the wire.
AirPort/802.11, Bonjour, Carbon, Cocoa, Core Foundation, Darwin, Hardware & Drivers, Internet & Web, Mac OS X Server, Printing, Security Technical Q&As 2008-06-03
URL Loading System (HTML) (PDF)
Explains how to manipulate URLs and transfer URL contents.
Cocoa Guides 2008-05-06
NSCachedURLResponse Class Reference (HTML) (PDF)
Describes a cached response to a URL load request.
Cocoa Reference 2008-05-02
DNS Service Discovery C Reference (HTML)
Describes the DNS Service Discovery API for implementing Bonjour in an application.
Bonjour, General Reference 2008-04-23
Core Services Identity Reference (HTML)
Describes the C API for creating, maintaining and finding users and groups.
Core Foundation, Security Reference 2008-04-08
Darwin Notification API Reference (HTML)
Describes the Darwin API for interprocess notification.
Darwin Reference 2008-04-08
Directory Service Framework Reference (HTML)
Describes the Directory Service Framework.
General, Mac OS X Server Reference 2008-04-08
Publication Subscription Framework Reference (HTML)
Describes the Cocoa framework for publishing and subscribing to RSS and Atom feeds.
Internet & Web Reference 2008-04-08
System Configuration Framework Reference (HTML)
Describes the API for configuration of network resources, the reachability of target hosts, and connection to network services.
Darwin, General Reference 2008-04-08
Bonjour Printer Subtype for HTTP (HTML)
QA1555: Describes how printer vendors can register their bonjour service such that Safari can see them.
Carbon, Cocoa, Core Foundation, Darwin Technical Q&As 2008-03-25
CryptNoMore (HTML) (DMG) (ZIP)
Shows how to authenticate a user using Open Directory (Directory Services).
Security Sample Code 2008-03-17
Network Device Driver Programming Guide (HTML) (PDF)
Background and task information about developing network drivers for Mac OS X.
Hardware & Drivers Guides 2008-03-11
NSURLCache Class Reference (HTML) (PDF)
Describes a collection of cached responses and data.
Cocoa Reference 2008-03-11
Embedding Bonjour in Windows Applications (HTML)
TN2210: Details the proper steps necessary for a Windows Developer to include Bonjour for Windows in their application.
Bonjour Technical Notes 2008-01-17
Mac OS X Server Command-Line Administration (PDF)
Explains how to use commands and configuration files to perform server administration tasks in a UNIX command shell.
Mac OS X Server Guides 2007-12-11
NSURLResponse Class Reference (HTML) (PDF)
Describes the metadata returned by a server for a load request.
Cocoa Reference 2007-12-11
Apple Remote Desktop Administrator's Guide Version 3.2 (PDF)
Explains how to install and configure Apple Remote Desktop and use it to remotely control and manage client computers.
Mac OS X Server Guides 2007-12-04
CCL Modem Scripting Release Notes (HTML)
Explains changes to modem CCLs for Mac OS X v10.5 and what to do to change existing and supersede older scripts.
Hardware & Drivers Release Notes 2007-10-31
CFNetwork Framework Release Notes (HTML)
General, Security Release Notes 2007-10-31
Code Signing Release Notes (HTML)
Security Release Notes 2007-10-31
Core Services Framework Reference (HTML) (PDF)
Describes the API for many fundamental operating system services.
General Reference 2007-10-31
Mac OS X Server Podcast Producer Administration (PDF)
Explains how to set up and manage Podcast Producer service to record, process, and distribute podcasts.
Mac OS X Server Guides 2007-10-31
Mac OS X Server System Image and Software Update Administration (PDF)
Explains how to use network-resident startup disks and how to set up a software update server.
Mac OS X Server Guides 2007-10-31
Mac OS X Server Xgrid Administration and High Performance Computing (PDF)
Explains how to set up and manage computational clusters of Xserve systems and Mac computers.
Mac OS X Server Guides 2007-10-31
OS Services Framework Release Notes (HTML)
Carbon Release Notes 2007-10-31
CFProxySupportTool (HTML) (DMG) (ZIP)
Shows how to use the CFProxySupport APIs to decide whether a network connection should pass through a proxy.
Core Foundation, Darwin Sample Code 2007-10-29
Descriptor Passing Problems (HTML)
QA1541: Describes how to work around common problems with descriptor passing.
Darwin Technical Q&As 2007-10-29
Leopard Technology Series for Developers: OS Foundations (HTML)
Leopard Overview article on system-level updates.
Bonjour Articles 2007-09-04
Don't forget to cancel your Bonjour resolve (HTML)
QA1297: Explains why it's important to cancel a Bonjour resolve operation.
Bonjour, Carbon, Cocoa Technical Q&As 2007-08-30
Collaboration Reference Update (HTML) (PDF)
Summarizes the symbols added to the Collaboration framework.
Cocoa Release Notes 2007-07-18
System Configuration Reference Update (HTML) (PDF)
Summarizes the symbols added to the System Configuration framework.
Darwin Release Notes 2007-07-18
CCL Modem Scripting Guide (HTML) (PDF)
Darwin, Hardware & Drivers Guides 2007-06-28
Directory Services for Mac OS X Server v10.5 Release Notes (HTML)
Describes updates, changes, and workarounds for Directory Services for Mac OS X Server v10.5
Mac OS X Server Release Notes 2007-06-08
MoreSCF (HTML) (DMG) (ZIP)
High-level wrapper around System Configuration framework, making common operations easy.
Darwin Sample Code 2007-06-07
Distributed Objects Programming Topics (HTML) (PDF)
Explains how Objective-C objects in different threads or different processes communicate.
Cocoa Guides 2007-06-06
NewsReader (HTML) (DMG) (ZIP)
Demonstrates use of the Publication Subscription framework to create a simple RSS reader application.
Cocoa, Internet & Web Sample Code 2007-06-01
Mac OS X Server Administrator Topics (HTML) (PDF)
Document that describes a variety of server administrator advanced operations.
Mac OS X Server Guides 2007-05-23
CFHTTPAuthentication Reference (HTML) (PDF)
Describes the C API for applying authentication credentials to HTTP messages.
Core Foundation Reference 2007-05-15
CBGroupIdentity Class Reference (HTML) (PDF)
Describes the class for operating on user identities.
Cocoa, Security Reference 2007-05-14
CBIdentity Class Reference (HTML) (PDF)
Describes the class used to create and operate on identities.
Cocoa, Security Reference 2007-05-14
CBIdentityAuthority Class Reference (HTML) (PDF)
Describes the class used to manipulate identity authority databases.
Cocoa, Security Reference 2007-05-14
CBIdentityPicker Class Reference (HTML) (PDF)
Describes the class that manages the identity picker.
Cocoa, Security Reference 2007-05-14
CBUserIdentity Class Reference (HTML) (PDF)
Describes the class for operating on user identities.
Cocoa, Security Reference 2007-05-14
Collaboration Framework Reference (HTML) (PDF)
Describes the Objective-C API for monitoring and editing identities.
Cocoa, Security Reference 2007-05-14
Identity Services Reference Collection (HTML) (PDF)
Describes the APIs for using identities and the Identity Picker.
Cocoa, Core Foundation, Security Reference 2007-05-14
LSMSmartCategorizer (HTML) (DMG) (ZIP)
Demonstrates the Latent Semantic Mapping (LSM) framework by automatically categorize RSS feeds.
Internet & Web Sample Code 2007-05-09
CFStream Reference (HTML) (PDF)
Describes the interface for creating streams.
Core Foundation Reference 2007-05-03
Directory Service Reference Update (HTML) (PDF)
Summarizes the symbols added to the Directory Service framework.
Mac OS X Server Release Notes 2007-05-02
NSInputStream Class Reference (HTML) (PDF)
Describes a read-only data stream.
Cocoa Reference 2007-04-05
NSURLConnection Class Reference (HTML) (PDF)
Describes the class that provides support for retrieving data from a server in response to a URL load request.
Cocoa Reference 2007-04-01
NSURLProtocol Class Reference (HTML) (PDF)
Describes the interface for protocol-specific loading of URL data.
Cocoa Reference 2007-04-01
NSURLRequest Class Reference (HTML) (PDF)
Describes a request for a resource identified by a URL.
Cocoa Reference 2007-04-01
NSHost Class Reference (HTML) (PDF)
Describes a representation of a network host.
Cocoa Reference 2007-03-24
Using the Web Services Core Framework and CFNetwork to Access Remote SOAP Services (HTML)
Learn how to access remote SOAP-based web services that require HTTP Basic or Digest authentication.
Internet & Web Articles 2007-03-07
Availability of Quartz Composer Patches in Web Kit (HTML)
QA1505: Details which Quartz Composer patches are available in Web Kit
Internet & Web Technical Q&As 2007-03-05
NSSocketPortNameServer Class Reference (HTML) (PDF)
Describes a registrar of named TCP/IP sockets.
Cocoa Reference 2007-02-26
NSMessagePortNameServer Class Reference (HTML) (PDF)
Describes a facility that accepts and returns message ports.
Cocoa Reference 2007-02-23
Advertising a Bonjour service on a specific set of networking interfaces. (HTML)
QA1513: Explains how to register a Bonjour service only on a specific set of networking interfaces.
Bonjour Technical Q&As 2007-02-12
Open Directory Programming Guide (HTML) (PDF)
Explains how to implement centralized storage and retrieval of information in Carbon.
Darwin, Mac OS X Server Guides 2007-01-08
tcplognke (HTML) (DMG) (ZIP)
Demonstrates a TCP socket filter based on supported Kernel Programming Interfaces for Tiger
Hardware & Drivers Sample Code 2006-11-27