Creates a rectangular region
_WinAPI_CreateRectRgnIndirect ( $tRECT )
|$tRECT||$tagRECT structure that contains the coordinates of the upper-left and lower-right corners of the rectangle that defines the region in logical units.|
|Success:||The handle to the region.|
When you no longer need the HRGN object, call the _WinAPI_DeleteObject() function to delete it.
Search CreateRectRgnIndirect in MSDN Library.