BOOL pascal EnumChildWindows(HWND hParent, BOOL (pascal *func)(),
                              DWORD lParam)

  This function will call the passed function for every descendant of
the window hParent. The handle of the window and lParam will be
passed as the arguments. The function will be called with the
arguments (hWnd, lParam). If any call of 'func' returns FALSE, then
EnumChildWindows() will return immediately without processing the
rest of the windows.

Parameters
  hWnd is the handle of the window whose children we want to enumerate.
  func is a pointer the function which will be called for each window.
  lParam will be passed as the second argument to that function.

Returns
  TRUE if hParent was a valid window handle, FALSE if not.