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Technical Q&As: Hardware
Networking services in Mac OS X include support for the major protocols and services. Developers can use these resources to design networking devices such as cables, network interface cards, and modems that are compatible with Apple products.

View all Networking Technical Q&As.
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Getting a Packet Trace (HTML) ()
QA1176: Lists tools available for looking at the network packets on the wire.
2004-07-13
Discovering all advertised Rendezvous service types (HTML)
QA1337: Explains how to discover all Rendezvous service types being advertised on the local network.
2004-06-01
Generating an NMI Without a Programmer's Switch (HTML) ()
QA1264: Explains how to generate a non-maskable interrupt (NMI) on CPUs without programmer's switches.
2004-04-26
Rendezvous enforces the service type format in Panther (HTML)
QA1198: Explains why registering a Rendezvous service might fail on Panther.
2004-03-23
The state of mDNSResponder (HTML)
QA1339: Explains how to obtain information regarding the internal state of mDNSResponder.
2004-02-06
Issues with boot time KEXT loading (HTML) ()
QA1087: Explains how to solve problems with loading KEXTs at boot time.
2004-01-15
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
Registering a Rendezvous service multiple times (HTML)
QA1311: Explains why registering the same Rendezvous service twice on the same machine doesn't cause a name conflict.
2003-10-23
IODeviceTree & the IORegistry (HTML) ()
QA1120: Describes the IODeviceTree plane in the Mac OS X IORegistry.
2002-02-13
Making sense of IOKit error codes (HTML) ()
QA1075: Explains how to interpret I/O Kit error codes.
2002-02-07
IOKit Framework Headers (HTML) ()
QA1107: Describes the differences between the headers in IOKit.framework and the I/O Kit headers in Kernel.framework.
2002-01-15
Adding dependencies with kmodload (HTML)
QA1097: Illustrates how to specify dependencies when using kmodload.
2001-12-05
The dreaded "incompatible flag -framework" error (HTML)
QA1096: Explains how to eliminate the incompatible flag -framework error in Project Builder.
2001-12-05
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
The "packages" node in the device tree (HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
2000-09-05
Is the Open Firmware device tree object oriented? (HTML)
HW80: Discusses the object-oriented attributes of the Open Firmware device tree.
1999-11-15
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
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
TCP/IP Option Sizes (HTML) ()
NW62: Enumerates the TCP/IP options and their sizes for Open Transport.
1999-04-26
Determining Open Firmware configuration variables (HTML) ()
HW56: Discusses how to determine the Open Firmware variables on a system.
1999-03-29
Expansion ROM device properties (HTML) ()
HW50: Describes the Open Firmware properties that should be included in a boot device's expansion ROM.
1999-03-29
Getting started with Forth (HTML) ()
HW53: Describes where FCode driver developers can get information about the Forth programming language.
1999-03-29
Why did the name of the PCI bridge change? (HTML) ()
HW59: Explains the name change of the PCI bridge to the generic name "pci" in Open Firmware.
1999-03-29
Are interrupts enabled while Open Firmware is running? (HTML) ()
HW44: Explains that interrupts are disabled when Open Firmware is running.
1999-02-15
What are configuration variables in Open Firmware? (HTML) ()
HW38: Defines the configuration variables in Open Firmware.
1999-02-15
What are snag keys in Open Firmware? (HTML) ()
HW35: Explains Open Firmware snag keys, including examples of their function.
1999-02-15
OTScheduleDeferredTask When Task Running (HTML) ()
NW52: Describes what happens when you use OTScheduleDefferedTask to schedule a task that is running.
1997-10-13
Changing the TCP Window Size (HTML)
NW47: Describes how to change the TCP window size in Open Transport.
1997-03-14
T_DATA_REQ vs M_DATA TPI Message Blocks (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
PCI Type 1 Cycles (HTML)
HW26: Describes the circumstances when the PowerMac generates a Configuration Type 1 command.
1995-07-15