<BUG>long                    lowest=0; // lowest seqno, used by ack()</BUG><CONTEXT>RetransmitCommand       retransmit_command = null;                            // called to request XMIT of msgfinal ConcurrentMap<Long,Message> msgs=new ConcurrentHashMap<Long,Message>();Interval                interval=new StaticInterval(400,800,1200,1600);final Retransmitter     retransmitter;static final Log        log=LogFactory.getLog(AckSenderWindow.class);<extra_id_0>public interface RetransmitCommand {void retransmit(long seqno, Message msg);}</CONTEXT>
long                    lowest=Global.DEFAULT_FIRST_UNICAST_SEQNO; // lowest seqno, used by ack()