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Leopard Reference Library: Hardware & Drivers
The Human Interface Device (HID) class is one of the device classes described in the USB standard. In Mac OS X, the HID Manager supports access to HID-class devices. For access to devices that provide tactile sensation to the user, the Force Feedback framework defines a programming interface that is functionally similar to Microsoft's DirectInput API.

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Building Customized User Client Drivers for USB Devices (HTML)
Learn how to write the setup code for card readers, bill validators, and other devices.
Articles 2006-06-26
HID Class Device Interface Guide (HTML) (PDF)
Explains how to develop applications to communicate with or control HID class devices.
Guides 2009-05-06
I/O Kit Framework Reference (HTML)
Describes the I/O Kit classes that support non-kernel access to I/O Kit objects through the device-interface mechanism.
Reference 2009-03-04
Kernel Framework Reference (HTML)
Describes the APIs and classes (including I/O Kit families) that support kernel-resident device drivers.
Reference 2009-01-06
Force Feedback Framework Reference (HTML)
Describes the public interfaces to the Force Feedback implementation in Mac OS X, including support for plug-ins.
Reference 2008-04-08
HID Config Save (HTML) (DMG) (ZIP)
Human Interface Device Manager Configuration sample
Sample Code 2008-05-07
SetMouseAcclSample (HTML) (DMG) (ZIP)
Find HID System Manager and get/set cursor acceleration
Sample Code 2006-11-28
USBPrivateDataSample (HTML) (DMG) (ZIP)
Demonstrates notifications when a USB device is hotplugged and associating arbitrary data with each device.
Sample Code 2006-10-16
HID Utilities Source (HTML) (DMG) (ZIP)
Shows a high level abstract library for the HID manager.
Sample Code 2003-10-06
HID Manager Basics (HTML) (DMG) (ZIP)
Shows basic use of HID Manager for Mac OS X: including device discovery, queues and polling elements.
Sample Code 2003-07-10
New HID Manager APIs for Mac OS X version 10.5 (HTML)
TN2187: Mac OS X version 10.5 introduces new APIs for the HID Manager.
Technical Notes 2008-01-23
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.
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.
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.
Technical Q&As 2008-09-18
The "packages" node in the device tree (HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
Technical Q&As 2006-02-22
Issues with boot time KEXT loading (HTML) (日本語 HTML)
QA1087: Explains how to solve problems with loading KEXTs at boot time.
Technical Q&As 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.
Technical Q&As 2003-10-28
SDRAM Problems With Self-Powered USB Devices (HTML) (日本語 HTML)
HW82: Alerts that non-compliant, self-powered USB devices plugged into a G4, can cause problems with low-voltage-sensitive SDRAM .
Technical Q&As 2003-08-21
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.
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.
Technical Q&As 2002-01-15
HID Manager Event Data Underruns (HTML)
QA1038: Explains how to correctly handle HID Manager event queue data underruns.
Technical Q&As 2001-06-13