Returned block contains :
0 Window handle
4 Visible area minimum x
8 Visible area minimum y
12 Visible area maximum x
16 Visible area maximum y
20 Scroll x offset
24 Scroll y offset
28 Handle to open window behind
32 Scroll x direction
36 Scroll y direction
Scroll directions :
-3 Autoscroll Left/Down
-2 Page Left/Down
-1 Left/Down
0
1 Right/Up
2 Page Right/Up
3 Autoscroll Right/Up
You use the scroll directions to update the scroll offsets, and then you do a Wimp_OpenWindow.
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