Hardware Abstraction Layer
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Hardware abstraction layer (HAL) sits between the OS and the hardware. It lets programmers write without regard to specific hardware. Drivers tell the HAL how to talk to hardware. This enables multitasking, portability of software, etc.
Links
Wikipedia
Advanced LinuxCNC Hal Tutorial
Intro to LinuxCNC Hal
http://img.youtube.com/vi/Va8c9g3NclA/default.jpg
