int pascal SetWindowWord(HWND hWnd, int iWord, WORD word)

  Sets the value of the single word residing at the 'iWord' position
in the window extra area.

Parameters
  hWnd is the window handle of the window to query.
  iWord is the 0-based word offset from the start of the window extra area.
  word is the single word value.

Returns
  The word at pWinExtra[iWord].