Returns an index identifying the virtual device.
PRL_RESULT PrlVmDev_GetIndex( PRL_HANDLE hVmDev, PRL_UINT32_PTR pnIndex );
PrlApiVm.h
PRL_RESULT. Possible values:
PRL_ERR_INVALID_ARG - invalid handle or invalid handle type, or null pointer was passed.
PRL_ERR_SUCCESS - function completed successfully.