## Virtual Device Driver Reference for OS/2

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### VDHOpenVDD

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    Format
    Parameters
    Return Codes
    Purpose
    Glossary

This function returns a handle to a virtual device driver that can be used with VDHRequestVDD to enable a virtual device driver to communicate with another virtual device driver. The name must be one that was previously registered by using VDHRegisterVDD.

    #include mvdm.h

    PSZ     VDDName;  /*  Pointer to the name of the virtual device driver to open */

    HVDD    rc;

    rc = VDHOpenVDD(VDDName);