Entry
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 Shift-Tab) or Down arrow (or Tab).
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.
Provided by Caret
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