Opens a virtual device driver (VDD), and returns a handle for it.

#define INCL_DOSMVDM
#include <os2.h>

PSZ       pszVDD;  /*  The ASCIIZ name of the virtual device driver to be opened. */
PHVDD     phvdd;   /*  A pointer to the HVDD in which the handle of the virtual device driver is returned. */
APIRET    ulrc;    /*  Return Code. */

ulrc = DosOpenVDD(pszVDD, phvdd);