## Physical Device Driver Reference

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### 16h - Remarks

This is done to allow the Category 09h generic IOCtls to be routed appropriately to the correct device driver. This command is not tied to a particular unit that the physical device driver owns, but is directed to the driver as a general query of its device support.

The physical device driver must perform the following actions:

Set the byte count as discussed above (1-based)
Set the status WORD in the request header