This function returns the window handle of a dialog item within a dialog window.

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

HWND     hwndDlg;   /*  Dialog-window handle. */
HWND     hwnd;      /*  Child-window handle. */
ULONG    code;      /*  Item-type code. */
HWND     hwndItem;  /*  Item-window handle. */

hwndItem = WinEnumDlgItem(hwndDlg, hwnd, code);