WDM

Win32 Driver ModelA 32-bit driver model based on the Windows NT driver model that is designed to provide a common architecture of I/O services and binary-compatible device drivers for both Windows NT and Windows operating systems for specific classes of drivers. These driver classes include USB and IEEE 1394 buses, audio, still-image capture, video capture, and HID-compliant devices such as USB mice, keyboards, and joysticks. Provides a model for writing kernel-mode drivers and minidrivers, and provides extensions for Plug and Play and power management.WDM DDK: Provides the supplementary header files used together with the Windows NT DDK to build WDM drivers. WDM power management: Facilities provided in WDM for drivers to implement power policy and control. DDIs are defined for synchronizing power state changes with other power management activities in the system and for detecting device idleness. IRPs are defined for setting power sate, enabling wakeup, and querying power status.