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int pascal WinSaveRect(HWND hWnd, LPRECT r, BYTE *rectbuf)

  This function saves a portion of the screen to a memory location.
Please note that no clipping is performed by this function.

Parameters
  hWnd is a handle to a window.
  r is a pointer to a RECT structure.
  rectbuf points to a block of memory which will save both the
   characters and attributes contained within rectange r. The block must
   be large enough to hold (area * 2) bytes of data. Warning : this
   function will not do any kind of size checking.

Returns
  Nothing.