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*     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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