1  #pragma once
 2  
 3  #define WIN32_LEAN_AND_MEAN
 4  #include <Windows.h>
 5  
 6  namespace convert
 7  {
 8      // Converts a given point from multi-monitor coordinate system to the one relative to HWND
 9      inline POINT FromSystemToWindow(HWND window, POINT p)
10      {
11          ScreenToClient(window, &p);
12          return p;
13      }
14  }