## Virtual Device Driver Reference for OS/2

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### VDHOpenPDD Return Value - rc

rc (FPFNPDD) - returns

Success If the function is successful, it returns a pointer to the physical device driver Inter-Device-Driver Communication (IDC) function. See " RegisterPDD" in the OS/2 Physical Device Driver Reference for a description of the physical device driver's IDC function.

Failure If the function fails, it returns 0 (zero). VDHGetError should be called to determine the nature of the problem.