## Virtual Device Driver Reference for OS/2

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### VDHOpenVIRQ Return Value - rc

rc (HIRQ) - returns

Success If the function is successful, it returns an IRQ handle.

Failure If the function fails, it returns 0 (zero). VDHGetError should be called to determine the nature of the problem. If IRQNumber, EOIHandler, IRETHandler, or OptionFlag are invalid, a system halt occurs.