All the things that you can use SETV, ADDV, CHAR, etc. with! :D
vaXX
ovXX
mvXX
NAME k
MAME k
GAME k
EAME k
AVAR a i
P1
P2
FROM
VELX
VELY
But interestingly, not:
POSX
POSY
ACCG
Any others? :>
And to be sure, all of them are readwrite, none are readonly nor writeonly? :>
(See #25 and #26 that Verm figured out :3 )