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LONG pascal SetWindowLong(HWND hWnd, int iLong, LONG llong)

  Sets the value of the single long residing at the 'iLong' position
in the window extra area.

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

Returns
  The long at pWinExtra[iLong].