1.Run Server.java first to monitor

　　2.read n_port. In this program and the n-port are 6060.

　　3.In the Client window, you will see

　　　　"Remember the n_port and r_port are both 6060"

　　　　"Please input the host name of server"

　　4.Since I tested the program on computer with number ENVGEDDES27.NEXUS.UWATERLOO.CA

　　 type "ENVGEDDES27.NEXUS.UWATERLOO.CA" and press "enter"

　　5.The Client window will show

　　　　"Sever host name is: ENVGEDDES27.NEXUS.UWATERLOO.CA"

　　　　"Please input a introduction:"

　　6.Type who you are and say hello. For example:

　　　　"Hello, this is Mary"

　　7.At this time, the Client machine will remind you to input message:

　　　　"please input msg:"

　　8.Type what you want to say. For example:

　　　　"Nice to meet you!"

　　9.The program will show:

　　　　"FROM SERVER: .uoy teem ot eciN"

　　 and remind you the program is end:

　　　　"end"-Use TCP and UDP to send and reseive msg and reserve it