This function finds the handles of child windows that belong to a specified window and have window identities within a specified range.

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

HWND     hwndParent;  /*  Parent-window handle. */
PHWND    prghwnd;     /*  Window handles. */
ULONG    idFirst;     /*  First window identity value in the range (inclusive). */
ULONG    idLast;      /*  Last window identity value in the range (inclusive). */
LONG     lWindows;    /*  Number of window handles returned. */

lWindows = WinMultWindowFromIDs(hwndParent,
             prghwnd, idFirst, idLast);