Using multiple mouse separately

I want to use at least 2 mouse at the same time (on windows). Those are two logitech optical wheel mouse. I need to have the variation on the X & Y axis of both mouse, separately.

I've tried enumerating the devices with Direct X 8.1 to no avail (well, that's my first try) since I only get one GUID even if I have two mices connected. Moving any of them move the cursor so yes they are both working.

I've included that in the mouse input sample coming with the Direct X 8.1 SDK

std::vector<GUID> aGUID;

BOOL CALLBACK DIEnumProc(LPCDIDEVICEINSTANCE lpddi, LPVOID pvRef)
{
   aGUID.push_back(lpddi->guidInstance);
   return DIENUM_CONTINUE;
}

in the OnCreateDevice fct after the Direct Input object creation.

     aGUID.clear();
     g_pDI->EnumDevices(DI8DEVTYPE_MOUSE, DIEnumProc, 0, DIEDFL_ATTACHEDONLY);

     {
          std::ostringstream os;
          std::hex(os);
          os << "GUID" << std::endl;

          for (int i = 0; i<aGUID.size(); ++i) {
               os << aGUID[i].Data1 << " " << aGUID[i].Data2 << " " << aGUID[i].Data3 << std::endl;
          }

          std::string lReponse = os.str();
          MessageBox(NULL, lReponse.c_str(), "TEST", MB_OK);
     }


I've also tried DIDEVTYPE_HID but I get no device. (and DIEDFL_ALLDEVICES, INCLUDEHIDDEN ..)

I tried direct x since I though we had access to everything... if that's not the solution feel free to use something else, if it's on windows..

I really need to get that working!
Thank you a lot,
  PIBM

2X pts bonus if I get a working answer before Valentine's Day! ;)