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Leopard Technical Q&As: Hardware & Drivers
Mac OS X supports the major networking protocols and services and provides APIs that software developers can use to access network configurations, drive networking devices, or modify the functionality of networking stacks. Hardware developers can use Mac OS X networking services to design networking devices that are compatible with Apple products.

View all Networking Technical Q&As.
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Allocating and sharing memory with user space from an I/O Kit driver (HTML) (日本語 HTML)
QA1197: Describes the preferred technique for allocating and sharing buffers in an I/O Kit kernel driver.
2008-10-13
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.
1999-10-11
Bonjour enforces the service type format in Panther (HTML)
QA1198: Explains why registering a Bonjour service might fail on Panther.
2004-03-23
Changing the TCP Window Size (HTML)
NW47: Describes how to change the TCP window size in Open Transport.
1997-03-14
The "chosen" node in the device tree (HTML)
HW88: Describes how to find the "chosen" node in the Open firmware device tree.
2000-09-05
Discovering all advertised Bonjour service types (HTML)
QA1337: Explains how to discover all Bonjour service types being advertised on the local network.
2004-06-01
The dreaded "incompatible flag -framework" error (HTML)
QA1096: Explains how to eliminate the incompatible flag -framework error in Project Builder.
2001-12-05
ExpressCard Prevents System Sleep (HTML)
QA1517: Describes how some ExpressCard cards can prevent system sleep and how to fix the problem.
2007-02-28
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.
2008-10-13
Getting a Packet Trace (HTML) (日本語 HTML)
QA1176: Lists tools available for looking at the network packets on the wire.
2008-06-03
How to use the OT modem script engine (HTML) (日本語 HTML)
Deprecated - NW50: Shows how to use the Open Transport modem script engine.
1997-07-11
Installing an I/O Kit KEXT Without Rebooting (HTML)
QA1319: Describes the state of the art of installing I/O Kit kernel extensions (KEXTs) without requiring a restart.
2003-10-28
IODeviceTree and the I/O Registry (HTML) (日本語 HTML)
QA1120: Describes the IODeviceTree plane in the Mac OS X I/O Registry.
2008-09-18
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.
2002-01-15
Issues with boot time KEXT loading (HTML) (日本語 HTML)
QA1087: Explains how to solve problems with loading KEXTs at boot time.
2004-01-15
Making sense of IOKit error codes (HTML) (日本語 HTML)
QA1075: Explains how to interpret I/O Kit error codes.
2002-02-07
Mixing link-local IP addresses and routable IP addresses (HTML)
QA1357: Explains how to enable communication between devices with link-local addresses and devices with routable addresses.
2005-07-06
OTScheduleDeferredTask When Task Running (HTML) (日本語 HTML)
NW52: Describes what happens when you use OTScheduleDefferedTask to schedule a task that is running.
1997-10-13
The "packages" node in the device tree (HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
2006-02-22
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.
2002-02-13
Registering a Bonjour service multiple times (HTML)
QA1311: Explains why registering the same Bonjour service twice on the same machine doesn't cause a name conflict.
2003-10-23
The state of mDNSResponder (HTML)
QA1339: Explains how to obtain information regarding the internal state of mDNSResponder.
2006-10-03
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.
1996-10-25
TCP/IP Option Sizes (HTML) (日本語 HTML)
NW62: Enumerates the TCP/IP options and their sizes for Open Transport.
1999-04-26
What are configuration variables in Open Firmware? (HTML) (日本語 HTML)
HW38: Defines the configuration variables in Open Firmware.
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.
1999-02-15