=> R1 = Pointer to block :
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
<= R1 + [4..24] updated to indicate new location.
This call updates the list of active windows. It is used
1) When you open a window for the first time, and
2) When the window moves, scrolls or resizes.
The Wimp will issue redraw messages to you, if necessary. Under the nested Wimp, its use is slightly different.
Note: Prior to the nested Wimp you could not open windows belonging to other tasks. You were (and still are) able to send other tasks open window requests.
See PRM 3, page 112.
Wimp_OpenWindow (nested version)
=> R1 = pointer to block as Wimp_OpenWindow, plus
32 Window flags (if b0 of nesting flags set)
or 0 to flush all pending opens to the screen
R2 = "TASK" (&4B534154)
R3 = window handle of parent, or -1 for the top-level
R4 = nesting flags
This call opens a window within another window. Only present on versions of the Window Manager later than 3.80.
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