Used in conjunction with the contents of 32728. Holds the ASCII code of the last key pressed while writing on a blackboard (see 24175), or the descent table identifier (252-255; see 64460), or the LSB of the address of a routine (or an entry point to a routine) for dealing either with ERIC or with the result of an action by ERIC (see 57669):

Address	Purpose	Placed here by
23877	Remove the water pistol from the inventory	23863
24272	Deal with ERIC when he's raising his fist	24263
24290	Deal with ERIC when he's lowering his fist
24304	Deal with ERIC when he's raising the catapult	24296
24314	Launch a pellet from ERIC's catapult
24324	Deal with ERIC after he's launched a catapult pellet
24458	Deal with ERIC when he's kissing HAYLEY	24348
31462	Release some mice	57893
31573	Make ERIC catch a mouse or frog (if present)	57637
63586	Deal with a dropped stinkbomb	28992
63915	Control water fired from the pistol	63898