This function retrieves a pointer value from the memory of the reserved window word.

#define INCL_WINWINDOWMGR /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>

HWND     hwnd;   /*  Window handle which has the pointer to retrieve. */
LONG     index;  /*  Zero-based index of the pointer value to retrieve. */
PVOID    pRet;   /*  Pointer value. */

pRet = WinQueryWindowPtr(hwnd, index);