## Virtual Device Driver Reference for OS/2

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### VDHDevBeep

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This function performs the preempt beep request on behalf of the requesting virtual device driver.

    #include mvdm.h

    ULONG    Frequency;  /*  Frequency of the beep in hertz */

    ULONG    Duration;   /*  Duration of the beep in milliseconds */

    BOOL     rc;

    rc = VDHDevBeep(Frequency, Duration);