=> R1 = pointer to block
<= R0 corrupted
Block contains :
0 Mouse x
4 Mouse y
8 Button state
12 Window handle (-1 for backgr, -2 for iconbar)
16 Icon handle
This would appear to return not the current mouse state but its state when the last Wimp_Poll was executed. This means that it is perfectly safe to use it after a long menu click delay to recreate the menu or as a means of dragging boxes.
See PRM 3, page 143.
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