* R0 = Window handle
R1 = Icon handle
R2 = Foreground colour
R3 = Background colour
* All registers preserved
Not re-entrant.
Set an icon's colour
Basic example:
SYS "ddu_SIC",Window,Icon,7,11
ddu_SIC Background colour
If R3 = 0..15 the icon gets a filled background
If R3 = -1 the icon background gets transparent
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