g_lpDI->CreateDevice(GUID_SysMouse, &g_pMouseDevice, NULL);
g_pMouseDevice->SetDataFormat(&c_dfDIMouse2);
g_pMouseDevice->SetCooperativeLevel(hWnd, DISCL_NONEXCLUSIVE | DISCL_BACKGROUND);
g_hMouseEvent = CreateEvent(NULL, FALSE, FALSE, NULL)
g_pMouseDevice->SetEventNotification(g_hMouseEvent)
...
g_pMouseDevice->SetProperty(DIPROP_BUFFERSIZE, &dipdw.diph)
g_pMouseDevice->Acquire()

DIMOUSESTATE2 dims2;
ZeroMemory( &dims2, sizeof(dims2) );
g_pMouseDevice->GetDeviceState( sizeof(DIMOUSESTATE2), &dims2 )
g_pMouseDevice->Acquire()