From the NannyMUD documentation

LAST CHANGE

2000-12-11

FUNCTION

NAME
        interactive - determine if an object is interactive or not


SYNTAX
	int interactive(object ob)

DESCRIPTION
	This function returns true if the specified object `ob' is an
	interactive player and false otherwise.

        By `interactive' it is basically meant that there is an active
        connection to ob (it returns true for all non-linkdead players and
        false for every other object).

	If no argument is given, `this_object' is used by default.


SEE ALSO
        this_player in efun/object_related/this_player