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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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Adding dependencies with kmodload (HTML)
QA1097: Illustrates how to specify dependencies when using kmodload.
2001-12-05
Are interrupts enabled while Open Firmware is running? (HTML) (日本語 HTML)
HW44: Explains that interrupts are disabled when Open Firmware is running.
1999-02-15
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
Determining Open Firmware configuration variables (HTML) (日本語 HTML)
HW56: Discusses how to determine the Open Firmware variables on a system.
1999-03-29
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
Expansion ROM device properties (HTML) (日本語 HTML)
HW50: Describes the Open Firmware properties that should be included in a boot device's expansion ROM.
1999-03-29
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 an NMI Without a Programmer's Switch (HTML) (日本語 HTML)
QA1264: Explains how to generate a non-maskable interrupt (NMI) on CPUs without programmer's switches.
2004-04-26
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 & the IORegistry (HTML) (日本語 HTML)
QA1120: Describes the IODeviceTree plane in the Mac OS X IORegistry.
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.
2002-01-15
Is the Open Firmware device tree object oriented? (HTML)
HW80: Discusses the object-oriented attributes of the Open Firmware device tree.
1999-11-15
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
Mapping kernel memory to user space on Mac OS X 10.2 (HTML) (日本語 HTML)
QA1197: Describes a change to mapping kernel memory to user space affecting Mac OS X 10.2 and later.
2002-09-13
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
PCI Type 1 Cycles (HTML)
HW26: Describes the circumstances when the PowerMac generates a Configuration Type 1 command.
1995-07-15
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
Sample code for allocating an amount of dictionary space (HTML)
HW71: Discusses the allocation and the setting of memory for Dictionary space in Open Firmware.
1999-10-11
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
What is the "dump" word and how do I use it? (HTML)
HW68: Describes the function of the Open Firmware word "dump" and how it can be used.
1999-10-11
What numeric base is the default for the Open Firmware user interface? (HTML)
HW65: Describes how the default numeric base used by the Open Firmware user interface is hexadecimal.
1999-10-11
Why did the name of the PCI bridge change? (HTML) (日本語 HTML)
HW59: Explains the name change of the PCI bridge to the generic name "pci" in Open Firmware.
1999-03-29