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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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Bonjour and wake from sleep (HTML)
QA1290: Explains why applications that use Bonjour should stay registered and continue browsing on sleep.
Bonjour, Carbon, Cocoa Technical Q&As 2003-09-18
NSL and how it relates to Bonjour (HTML)
QA1299: Explains the relationship between NSL and Bonjour.
Bonjour Technical Q&As 2003-09-18
PPPoE Server for Testing (HTML) (日本語 HTML)
QA1252: Describes how to configure Mac OS X as a PPPoE server for testing purposes.
Carbon, Cocoa Technical Q&As 2003-04-11
Internet Connect Speed (HTML) (日本語 HTML)
QA1165: Describes how to get the modem connection speed from the System Configuration framework dynamic store.
Carbon, Internet & Web Technical Q&As 2003-03-26
Accessing HTTPS Proxy Settings (HTML) (日本語 HTML)
QA1234: Describes how to programatically access Secure Web Proxy information.
Carbon, Mac OS X Server Technical Q&As 2003-02-19
URL Access and the Missing Progress Dialog (HTML) (日本語 HTML)
Deprecated - QA1140: Explains a known bug in URL Access related to progress dialogs.
Carbon Technical Q&As 2002-09-23
Setting request headers in URL Access (HTML) (日本語 HTML)
Deprecated - QA1073: Explains how to work around a bug in URL Access when setting request headers.
Carbon Technical Q&As 2002-09-10
Power Management; Policy Maker vs. Power Controller (HTML) (日本語 HTML)
QA1121: Describes the differences between a Power Management Policy Maker and a Power Management Power Controller.
Hardware & Drivers Technical Q&As 2002-02-13
IOKit Framework Headers (HTML) (日本語 HTML)
QA1107: Describes the differences between the headers in IOKit.framework and the I/O Kit headers in Kernel.framework.
Hardware & Drivers Technical Q&As 2002-01-15
Getting the User and Computer Name (HTML)
QA1078: Describes how to get the user and computer name on Mac OS X.
Carbon, Core Foundation Technical Q&As 2001-10-30
How to use URL Access with proxy servers (HTML)
Deprecated - QA1074: Explains how to use URL Access with proxy servers.
Carbon Technical Q&As 2001-10-02
Open Transport Libraries (HTML) (日本語 HTML)
NW18: Lists the Open Transport libraries and what to link with for PowerPC and 68K.
Carbon Technical Q&As 2000-11-03
The "chosen" node in the device tree (HTML)
HW88: Describes how to find the "chosen" node in the Open firmware device tree.
Hardware & Drivers, Internet & Web Technical Q&As 2000-09-05
When to use PCMCIA, PC Card, and CardBus (HTML)
HW77: Explains the differences between PCMCIA, PC Card, and CardBus.
Hardware & Drivers Technical Q&As 1999-11-15
Raw IP and Open Transport 2.5.x (HTML)
Deprecated - NW63: Discusses Open Transport 2.5's change to the behavior of raw IP endpoints with IP_HDRINCL set.
Carbon Technical Q&As 1999-10-25
Are the Name Registry device tree nodes unique? (HTML)
Deprecated - HW64: Discusses whether Name Registry nodes copied from the Open Firmware device tree are unique.
Hardware & Drivers Technical Q&As 1999-10-11
Launching the Default Internet Browser (HTML) (日本語 HTML)
NW60: Shows with sample code how to invoke a user's default browser to open a specific URL.
Internet & Web Technical Q&As 1999-10-11
Allocate and Disk Full Error (HTML) (日本語 HTML)
FL12: Discusses a problem with AFP volumes displaying incorrect free space, and returning disk full errors.
Carbon, Cocoa Technical Q&As 1999-07-21
TCP/IP Option Sizes (HTML) (日本語 HTML)
NW62: Enumerates the TCP/IP options and their sizes for Open Transport.
Carbon, Hardware & Drivers, Internet & Web Technical Q&As 1999-04-26
fBroadCastAddr Always Zero (HTML) (日本語 HTML)
Deprecated - NW58: Explains why the fBroadcastAddr field may be zero after a call to OTInetGetInterfaceInfo and includes the workaround.
Carbon Technical Q&As 1999-03-08
Difference between using Restart or Shut Down in the Finder's Special menu in Open Firmware (HTML) (日本語 HTML)
HW47: Explains the differences between using Restart or Shut Down on Open Firmware
Hardware & Drivers Technical Q&As 1999-02-15
What are snag keys in Open Firmware? (HTML) (日本語 HTML)
HW35: Explains Open Firmware snag keys, including examples of their function.
Hardware & Drivers Technical Q&As 1999-02-15
Determining if a Drive is a Network Volume (HTML) (日本語 HTML)
NW09: Shows how to determine if a volume is mounted over the network.
Carbon Technical Q&As 1998-06-01
Numerous Small Packet Exchanges Resultin Poor TCP Performance (HTML) (日本語 HTML)
NW26: Explains why numerous small package exchanges result in poor TCP performance.
Carbon Technical Q&As 1998-05-25
Receiving UDP Broadcasts (HTML) (日本語 HTML)
Deprecated - NW53: Explains why UDP endpoints may never receive UDP broadcast messages.
Carbon Technical Q&As 1997-11-17
OTScheduleDeferredTask When Task Running (HTML) (日本語 HTML)
NW52: Describes what happens when you use OTScheduleDefferedTask to schedule a task that is running.
Carbon, Cocoa, Hardware & Drivers Technical Q&As 1997-10-13
68K Open Transport Code on Power Macintoshes (HTML)
Deprecated - NW48: Explains why running Open Transport 68K code on a PowerPC may not always work.
Carbon Technical Q&As 1997-03-14
Changing the TCP Window Size (HTML)
NW47: Describes how to change the TCP window size in Open Transport.
Carbon, Cocoa, Hardware & Drivers Technical Q&As 1997-03-14
T_DATA_REQ vs M_DATA TPI Message Blocks (HTML) (日本語 HTML)
NW42: Explains why OT passes data to a TPI module using M_DATA message blocks instead of M_PROTO+T_DATA_REQ.
Carbon, Cocoa, Core Foundation, Hardware & Drivers, Internet & Web Technical Q&As 1996-10-25
Server Endpoint 'qlen' Limit (HTML) (日本語 HTML)
Deprecated - NW38: Tells how to determine the maximum 'qlen' value which limits the number of supported handoff endpoints.
Carbon Technical Q&As 1996-08-21
Calling CloseOpenTransport When Writing an App (HTML) (日本語 HTML)
Deprecated - NW36: Identifies a bug in Open Transport 1.1 which means your application must CloseOpenTransport before quitting.
Carbon Technical Q&As 1996-07-03
OTScheduleSystemTask Cleanup (HTML) (日本語 HTML)
Deprecated - NW37: States the proper way to clean up any pending system tasks scheduled with OTScheduleSystemTask.
Carbon Technical Q&As 1996-07-03
Aborting a OTConnect in Progress (HTML)
Deprecated - NW29: Describes the proper way to abort OTConnect, and why after calling OTSndDisconnect you may receive "kOTOutStateErr".
Carbon Technical Q&As 1996-05-14
Handing Off TCP Connections to a Different Port (HTML) (日本語 HTML)
NW25: Explains that a passive TCP connection cannot hand off the connection to a different port address.
Carbon Technical Q&As 1996-05-14
PSetSelfSend in Classic AppleTalk vs. Open Transport AppleTalk (HTML) (日本語 HTML)
NW23: Describes the relationship between PSetSelfSend in Classic AppleTalk and Open Transport AppleTalk.
Carbon Technical Q&As 1996-05-14
Synchronous TCP OTConnect Client Call Completes Before Server Responds (HTML) (日本語 HTML)
Deprecated - NW24: Explains why an OTConnect call will complete before the server responds.
Carbon Technical Q&As 1996-05-14
TCP Application Acquires Different Port Address After Relaunch (HTML)
Deprecated - NW28: Explains why a server application acquires a different TCP/IP port address after restarting.
Carbon Technical Q&As 1996-05-14
TCP Option Sizes (HTML)
Deprecated - NW27: Tells where to get more information on TCP Option sizes and setting TCP Options.
Carbon Technical Q&As 1996-05-14
Error -3168 (kOTStateChangeErr) and Handoff Endpoints (HTML) (日本語 HTML)
Deprecated - NW22: Explains why a kOTStateChangeErr -3168 occurs when there is a handoff endpoint involved.
Carbon Technical Q&As 1996-04-08
Closing the Connection: OpenTransport (HTML) (日本語 HTML)
Deprecated - NW20: Describes an orderly disconnect situation in Open Transport between two nodes.
Carbon Technical Q&As 1996-03-04
Open Transport Error -3208: kEBADFErr (HTML) (日本語 HTML)
NW21: Explains why a call to OTSnd may result in a kEBADFErr -3208.
Carbon Technical Q&As 1996-03-04