R0 = Key
R2 = Window handle
R3 = Icon handle
Exit:
R0 preserved if no action taken, 0 otherwise
Moves the caret from its current writeable icon to
the next one above or below (in number) if the key
in R0 is up arrow or down arrow. If you set bit 8
of R2 on entry to WimpExt_Initialise then this SWI
will be called automatically for you in
WimpExt_Action, and the reason code translated to
a null event if the key is processed.
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