NAME
	set_heart_beat - turn the heart beat calling on/off in current object

SYNOPSIS
	void set_heart_beat(int onflag)

DESCRIPTION
	This function turns on and off automatic calls every 2 seconds to
	the lfun heart_beat. If 'onflag' is 0 then calls is turned off, 
	otherwise calling is turned on. 

NOTA BENE
	heart_beats are costly. Use them only if neccessary. Especially
	do not use them for 'down counters' such as counting down the
	life time of a torch, use call_out for such purposes.

SEE ALSO
	call_out

CAVEAT
	If there is a runtime error in your heart_beat routine calling
	of the heart_beat will be automatically turned off.

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