## Input/Output Device Driver Reference

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### Virtual Device Driver to Physical Device Driver Communication

The primary function of this interface is to register the VDD with the PDD so that, later, the VDD can call the PDD back with data, establish the configuration setup (for example, physical mouse is attached or not, Touch display is calibrated or not, and so forth), and device control (such as emulation On or Off, DOS property exclusive access On or Off, and so forth) .

The following functions are supported:

Register VDD
Query configuration
Set emulation state
Disable
Set exclusive access