## Virtual Device Driver Reference for OS/2

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### VDHOpenVDD Return Value - rc

rc (HVDD) - returns

Success If the function is successful, it returns a handle to the virtual device driver.

Failure If the function fails, it returns 0 (zero). This can occur if:

The virtual device driver referenced by VDDName is not found.
The virtual device driver was found, but has not registered a worker function (the routine that gets control when this interface is called) for virtual device driver/virtual device driver communication.

If this function is called with invalid parameters or in the incorrect context, a system halt occurs.