R0 = Pointer to sprite name in the Wimp sprite pool, or 0 to reset pointer
If R0>=&8000:
R2 = Hotspot X
R3 = Hotspot Y
Stores the old pointer palette, and changes the pointer palette and shape to
the sprite specified in R0 (palette optional). The 'hotspot' is defined by
the X and Y coordinates (pixels) in R2 and R3. If R0 is <&8000 then it will
reset the pointer to its original state. You don't need to check if the
pointer is already reset or changed as WimpExtension will do this for you.
Note that the pointer will keep changed until you specifically ask for it to
be reset - ie. pointer changes over icons will be suspended, and the pointer
will remain changed outside your window's workarea.
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