Chat over the same LAN network among different computers always need a software to be installed. But now it is very easy to do the same without using any software or network settings. Mainly at office or home we have different computers are connected over LAN and have same IP. In this case we just have to open the browser and go to a particular URL WiFi Chat. It will open a text box to enter chat text. If any other user (computer) in the same network and using same IP open the same URL from browser then that user also see the chat text box. In this way different user can text chat over LAN.
Very simple and easy at all. This will be an open chat, so, no personal or confidential chat please.
This is completely an online application which works via Browsers only. You just need to open the link http://chatbyip.appspot.com/