In particular I want to override pageup and pagedown key

In J601, I can define a verb in the parent form locale,
parent_g_char=: 3 : 0
  if. VK_PRIOR -:&, a.i.sysdata do. NB. pageup key
    prevpage ''
  elseif. VK_NEXT -:&, a.i.sysdata do. NB. pagedown key
    nextpage ''
  elseif. do.
    char__grid sysdata ; sysmodifiers
  end.
)

Any idea how to do this in J602?

--
regards,
bill
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