java application that establish a connection between two or more ,they could chat and send files to each other , files ,images ,videos,with making the transfer as packetes orgnized as objects regulated with timers ,to resend the packet if its lost ,more over a threads used to make the time out corresponding to stop and wait protocol 3.0 version and calculated the percentage of success of the transmission. it works 100% ..Done by team work of ahmad droobi and yazan habash