●。 Portbase o Programmer does not need to modify all references to port numbers- safety o Solves the problem in general way generality o Solving the possible port conflicts-no conflicts 6 SIE, NTUT, Taiwan6 CSIE, NTUT, Taiwan Portbase  Programmer does not need to modify all references to port numbers – safety  Solves the problem in general way – generality  Solving the possible port conflicts – no conflicts