This function gets the window handle of the next window in a specified enumeration list.

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

HENUM    henum;     /*  Enumeration handle. */
HWND     hwndNext;  /*  Next window handle in enumeration list. */

hwndNext = WinGetNextWindow(henum);