ONKEYLEX “ON Curser Keys lexfile”. SIZE: 195 bytes.

CURSDOWN is like KEYDOWN but takes no argument, and responds only to
the four arrow keys, returning 1 through 4 respectively if one of
them is currently being pressed down.

CURSKEYS is like KEY$, but responds only to the four arrow keys and
the “g”-shifted up-arrow and down-arrow, returning 1 through 6
respectively if any of them is in the key buffer. Best used with the
ON statement, ONKEYLEX makes writing menus much simpler.

*** ONKEYLEX ***
(31898) File Header
(31913) E1/1F CURSDOWN fn
(319AA) E1/20 CURSKEYS fn
(31A43) Next File Header