Addresses of the handlers for message control codes $00 to $16, used by 72D4:

Code	Handler	Meaning
$00	735E	print the object whose address the caller pushed on the stack
$01	736D	print the word the caller pushed on the stack
$02	7375	jump forwards or backwards by the signed byte that follows
$03	7384	print the noun of the instrument in the current command ($B5ED)
$04	738B	print the pushed word with an article (a/an/the/some)
$05, $0A, $0F, $12	7382	do nothing
$06	739A	print the actor's name
$07	73A6	print the target with its article
$08	73B4	print a backspace (to join a word to the previous one)
$09	73B9	print the instrument with its article
$0B	73D7	call a sub-message at a relative address
$0C	73F0	print HIS or YOUR for the actor
$0D	72BA	new line
$0E	73FE	print HIS or YOUR for the target
$10	7403	print the actor's name and IS or ARE
$11	741C	the same for the target
$13	7424	the same for an object pushed on the stack
$14	7337	end the message with a new line
$15	733B	end the message with a full stop and a new line
$16	7352	end the message

The IS/ARE and HIS/YOUR codes are what let one message serve both the player and the characters: 'you are dead' and 'thorin is dead' are the same message.