NAME
	file_name - find the filename of an object

SYNOPSIS
	string file_name(object ob)

DESCRIPTION
	This function gives the filename of an object concatenated with
	a possible instance number. This typically is a string on the
	form "/std/weapon#423". Instance numbers are unique for all
	objects in the game.

	If a filename has no instance number it is the 'master object' and
	not a 'cloned copy'. 

Help topics available:

_destruct	_isclone	_lock	_next_clone	_query_action
add_action	all_inventory	call_other	call_out	call_out_info
clone_object	command	creator	deep_inventory	destruct
disable_commands	enable_commands	environment	exec	file_name
find_call_out	find_living	find_object	first_inventory	function_exists
inherit	inherit_list	input_to	interactive	living
move_object	next_inventory	present	previous_object	query_verb
remove_call_out	restore_object	save_object	set_heart_beat	set_light
set_living_name	shadow	tell_object	tell_room	this_object
this_player	transfer