| DMA | Direct Memory Access | |
| DMI | Desktop Management Interface | |
| DPC | Deferred Procedure Call | Runs at DISPATCH_LEVEL |
| ECP | Enhanced Centronics Port | IEEE P1284 (ECP) |
| endpoint | | USB logical connection point |
| Endpoint 0 | | A control endpoint that is present in all USB devices |
| EPP | Enhanced Parallel Port | |
| FDO | Functional Device Object | |
| frame | | A USB frame is the data sent in a 1ms interval |
| free build | | Optimized release retail build of a driver or Windows |
| GDI | Graphics Device Interface | |
| GMT | Greenwich Mean Time | Kernel system time is measured in 100ns units since January 1, 1601 in the GMT time zone. |
| GUID | Globally Unique Identifier | |
| guidgen | | GUID generator tool |
| HAL | Hardware Abstraction Layer | |
| HBA | Host Bus Adaptor | |
| HCT | Hardware Compatibility Tests | |
HKLM | HKEY_LOCAL_MACHINE | |
| HKR | Relative registry key | Used in installation INF files. See Chapter 11 for more details. |
| HID | Human Input Device | |
