WinPopup Gold 3.1.1
This is a useful tool for sending or receiving messages and chatting through your local network.
There's no server needed and no IP address to set up.
You can point and send messages from other active WinPopup Gold clients. You can send, receive and manage messages using a customizable contact and media address book.
This detects who's connected in real time and gives you a list of valid destinations to choose from. It even lets you send files and assign attributes like sounds and photos to each contact.