Returned block contains :
0 Address of poll word
4 Contents of poll word
This message is returned when the poll word becomes non-zero. If bit 23 of the Wimp_Poll mask is set then this may be before messages and redraw requests have been returned (for example Message_ModeChange) which allows tasks to make updates to data which affect the contents of windows before the windows have been redrawn with out of date contents. With the bit clear this message is received at lower priority than user messages and redraw requests.
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