Thanks to all, I did get this working. My test app does re-enumerate the 
device, which afterwards is present and usable. [I have assumed that after 
re-enumeration I do not need to issue a USBDeviceClose().]

Thanks for the additional links. From now I will have time to actually take a 
breath, study up, and get things going properly. I was tasked to come up with a 
yes/no answer to this problem by end of business day today, which is why I was 
rushing into things pell-mell. Fortune favors the foolish.

Thanks again for all the help!
-Carl


On Dec 15, 2014, at 5:26 PM, Fernando Urbina <[email protected]> wrote:

> 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/referencelibrary/GettingStarted/GS_HardwareDrivers/_index.html
> 
> 
> Woof,
> 
> Nano Urbina
> Build Slave
> Razz Software
> http://www.razzsoftware.com   
> 

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