=> R1 = block containing window handle
<= R0 corrupt
Block at R1 updated
This SWI returns the coordinates of a rectangle which completely covers the window, borders and all.
Under the nested Wimp, this call will now work if the window has not been opened. See Wimp_ForceRedraw for details of how to redraw the titlebar under the nested Wimp.
See PRM 3, page 182.
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