private String _toString(String delim)
	{
		String ret = Integer.toString(id) + delim + date.getTimeInMillis();
		
		// past/future flag and notes (empty for Future meetings)
		if(this instanceof FutureMeeting)
			ret += delim + "F" + delim;
		else
			ret += delim + "P" + delim + ((PastMeetingImpl)this).getNotes();
		
		// inefficient but perhaps acceptable here
		for(Contact contact : contacts)
		{
			ret += delim + contact.getId();
		}
		return ret;		
	}