Which to connect to play with Chat Server and Client?

I have an Arduino Uno Board and Arduino Ethernet Shield Board, and I pile it up.
Then I have connect my Laptop to UNO using RS-232 and my Ethernet shield to another PC using LAN cable.
Then I compile ChatServer in my Laptop then I upload it, then I compile ChatClient in my PC.
Then I open for the serial monitor of my Laptop and PC, but it show none.

Is there any wrong with my cable connection? or my steps?

I get the code of ChatServer (http://arduino.cc/en/Tutorial/ChatServer)and ChatClient (http://arduino.cc/en/Tutorial/ChatClient).
I insert mac address same with my Ethernet Board mac address.
The IP for the server is different with the Client, the rest is just the same with the code there.

Anyone can help me? I'm really newbie in Networking and Microcontroller

Vielen Dank.

Anyone can help me to solve this?

my Ethernet shield to another PC using LAN cable.

Did you use a cross-over cable?

I guess not cross-over, it is straight cable, since I found the color of both head:

white strip orange
orange
white strip green
blue
white strip blue
green
white strip brown
brown

then I compare with the result I found here http://www.bb-elec.com/tech_articles/EthernetCables_illustration.asp

what do you think?

Anyway, should I use telnet in order to connect it?
I never know about telnet is.

According to the ChatServer and ChatClient library, I read the comment that I should use TelNet, but It doesnt show how to use it.

So, anyone can tell me how to work from ChatServer to ChatClient?
Should I use telnet?

any help is really really really APPRECIATED! =(

I would use telnet to test the chat server. It is on port 23. Get it responding first. I use PuTTY for telnet. There is a Linux and a Windows version.