[gameprogrammer] pingin'

I want make an application (c++ or delphi) that pings to an ip address. Is reponse add a "IP actived" message to a list 

second:
In a multiplayer LAN game using tcp/ip, I want make a game where, each time an user connects to the server, creates a sprite on the room. So, when a player on his own PC moves his character screen moves, on the other PC else, user player moves. Could you give a clue 

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