=> R1 = pointer to block :
0 Window handle (-1,-2 for iconbar)
4 Icon handle
8 EOR word
12 Clear word
<= R0 corrupt
This SWI sets the icon's flags as follows :
new = (old BIC clear_word) EOR EOR_word
C E Effect
0 0 Preserve bit
0 1 Toggle bit
1 0 Clear bit
1 1 Set bit
This SWI also causes the icon to be redrawn, even if no bits are changed.
See PRM 3, page 139.
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