Name: interactive - query if an object is interactive or not

Synopsis:
	int interactive(object ob)

Description:
	The interactive efun returns if an object is interactive, which
	means that it is either a currently connected user or network daemon.

Return value:
	It returns 1, if the object is interactive, else 0.

Examples:
	active = interactive(find_player("lars"))

See also: efun/userp, lib/resolve, efun/query_ip_number, efun/query_ip_name