help with building my web page…?

I am creating a website within my LAN. I have it hosted on one of my desktops via apache. there is something that I have been trying to add. I want to add like a private chat room. If that isnt possible at least a comment book. I want it all to stay within my LAN, and not transfer onto the internet. I hope this makes sense. So the chat room would be top choice but if that isnt going to happen for free then how would I go about adding a commentbox / guest book where the comments are saved onto that html page and not transmitted to internet

Both the chat room and comment box will involve some degree of server side scripting. You can find a lot of scripts for the above on Google…

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