Used by the routines at
25581,
25656,
25677,
26639,
26752,
27144,
32379 and
61463. Blanks out the address of the routine held in bytes 9 and 10 of the character's buffer, which has the effect of making the routine at
25296 consider the address held in bytes 3 and 4 of the character's buffer (normally a routine address from the command list) as the next candidate for controlling routine.