This game can be played between two players only, say A and B. So, one of you will play the roll of server, say A, while the other will play the role of client, say B. What that means is, A will run the TTTServer.jar file, while B will run the TTTClient.jar file.
(1) Just click on your TTTServer.jar executable and you will see something like the following:
(2) Just click on connect button and you will see something like the following:
Now, your friend should know your IP-address, if not then give it to her/him and ask them to follow their instructions.
(3) When your friend has entered your IP-address, then you can click OK and you are good to go. :)
(1) Just click on your TTTClient.jar executable and you will see something like the following:
(2) Just click on connect button and you will see something like the following:
(3) Enter your friends IP-address and click OK.
Thats it! Now, look at the top-left corner to see, if its your turn or not and also you can reset the game whenever you want.
Have FUN! :)