tclientsocket and userlist problems! can sumone help?

can sumone please help me out I got a problem with my userlist below is the login funcation for my simple lanchat it funcation is to send client id information to the client software the way I want it to work is so that when a person connects to the chat i sends his data to himself then broadcasts his current user id to any other clients connected.

the problem is it only adds the users on the newer client here a image to show you [img=] what the problem is .

if anyone can help me i will be grateful thanks alot

//oo Login Procedure ooooooooooooooooooooooooooooooooooooooooooooooooooooo

if com = 'Login' then
username := dat[0]; // your current user id
if MainForm.ListBox1.Items.IndexOf(username) >= 0 then
SendData(rSocket, '
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