From the NannyMUD documentation

LAST CHANGE

2000-12-15

FUNCTION

NAME
        query_living - is this a living thing?


LOCATION
	/obj/living_functions.c

SYNTAX
	int query_living();

DESCRIPTION
	This function returns 1. It should be defined by true living objects
	only; a simple enable_commands() should not motivate that you define
	this function.


SEE ALSO
        living in efun/object_related/living