Carl,

Read and understand the sample code I mentioned and peruse some of the 
documentation. You are asking very basic questions. These 2 documents are good:

https://developer.apple.com/library/mac/documentation/DeviceDrivers/Conceptual/IOKitFundamentals/Introduction/Introduction.html
 
<https://developer.apple.com/library/mac/documentation/DeviceDrivers/Conceptual/IOKitFundamentals/Introduction/Introduction.html>

https://developer.apple.com/library/mac/referencelibrary/GettingStarted/GS_HardwareDrivers/_index.html
 
<https://developer.apple.com/library/mac/referencelibrary/GettingStarted/GS_HardwareDrivers/_index.html>


Woof,

Nano Urbina
Build Slave
Razz Software
http://www.razzsoftware.com     

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