NetSendFaker is free software that works to send messages on a local network (LAN), so you can chat with fellow users LAN without using the default operating system software.

To run it, you just need to know the name of the computer that you want to send a message. Check the name of the computers connected in a LAN by opening Windows Explorer, then go to My Network Places folder.

This software is portable type. So you do not need to install it, but can be used directly.

http://www.nsasys.com/downloads/NetSendFaker.exe