## Virtual Device Driver Reference for OS/2

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### Virtual Device Driver/Virtual Device Driver Communication

Because dynamic linking is supported between virtual device drivers, multiple virtual device drivers can support inter-virtual device driver communication through dynamic links. Where these device drivers are supplied by multiple parties and it is not required that all of the virtual device drivers in the set be present, dynamic linking does not work. The virtual DevHlp services, VDHRegisterVDD, VDHOpenVDD, VDHRequestVDD, and VDHCloseVDD are used to overcome this limitation of dynamic linking. For details, see VDHRegisterVDD, VDHOpenVDD, VDHRequestVDD, and VDHCloseVDD.