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.....
chatmemo1.lines.Add('Du bisch drin das war ja einfach');
    DerClient.WriteLn(ChatNick+'>ist neu im Raum');
    usermemo2.lines.Add(ChatNick);
    Button1.Enabled:=false;
.......					

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DerClient.WriteLn(ChatNick+'>ist neu im Raum');					

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procedure TForm1.Button1Click(Sender: TObject);
begin
if n = true then begin
if length(nick) <= 0 then nick := 'Gast';
if length(nick) >= 10 then nick := 'Gast';
if pos(':',nick) > 0 then nick := 'Gast';
if edit1.Text <> '' then begin
if IsServer then begin
for i:= 0 to ServerSocket1.Socket.ActiveConnections - 1 do ServerSocket1.Socket.Connections[i].SendText(nick + ': ' + edit1.text);
memo1.Lines.add('');
memo1.lines.add(nick + ': ' + edit1.text);
end else
ClientSocket1.Socket.SendText(nick + ': ' + edit1.text);
edit1.text:= '';
edit1.SetFocus;
end;
end;
n:= false;
timer1.Enabled:= true;
end;					

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procedure TForm1.ClientSocket1Connect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
ClientSocket1.Socket.SendText(nick);
end;					

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procedure TForm1.ClientSocket1Disconnect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
ClientSocket1.Socket.SendText(':'+nick);
memo2.text:= '';
end;					

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procedure TForm1.ServerSocket1ClientRead(Sender: TObject;
  Socket: TCustomWinSocket);
var
rtext: string;
begin
rtext:= socket.ReceiveText;
if pos(':', RText) > 0 then begin
if pos(':', RText) = 1 then begin
delete(RText, 1, 1);
for i:= 0 to memo2.lines.count do if memo2.lines[i] = RText then begin
memo2.Lines.delete(i-1);
memo2.Lines.delete(i-1);
end;
sleep(10);
for i:= 0 to ServerSocket1.Socket.ActiveConnections - 1 do ServerSocket1.Socket.Connections[i].SendText(memo2.text);
end else begin
memo1.lines.add('');
memo1.Lines.Add(RText);
for i:= 0 to ServerSocket1.Socket.ActiveConnections - 1 do ServerSocket1.Socket.Connections[i].SendText(RText);
if sound then PlaySound('newmessage',HInstance, snd_ASync or snd_Memory or snd_Resource);
end;
end else begin
memo2.lines.add('');
memo2.lines.add('- ' + RText);
sleep(10);
for i:= 0 to ServerSocket1.Socket.ActiveConnections - 1 do ServerSocket1.Socket.Connections[i].SendText(memo2.text);
end;
end;					

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procedure TForm1.ClientSocket1Connect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
ClientSocket1.Socket.SendText(nick);
end;					

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procedure TForm1.IdTCPClient1Connected(Sender: TObject);
begin
IdTCPClient1.Socket.send(ChatNick);
end;