Detecting multi-touch

With message WM_GESTURE you can detect Multi touch events.
case WM_GESTURE:
{
HGESTUREINFO hgi = reinterpert_cast<HGESTUREINFO>(lParam);
If (GID_SELECT == wParam)
{
GESTUREINFO gi;

// Populate the GESTUREINFO structure with information about the gesture.
gi.cbSize = sizeof(GESTUREINFO);
if (GetGestureInfo(hgi, &gi))
{
// Call a function to process the Select gesture
ProcessSelect(*gi);
}
return 1;
}
// Fall through to DefWindowProc
break;
}

Additionally, GID_BEGIN, GID_END, GID_SCROLL you can dedect the gesture Events.
WM_GESTURE (Compact 2013) : http://msdn.microsoft.com/en-us/library/ee499665.aspx
GESTUREINFO (Compact 2013) : http://msdn.microsoft.com/en-us/library/ee503892.aspx