This program provides secure, instant messaging between users on your LAN. The peer-to-peer system requires no central server or administration. There are extensive workgroup features, and replies can be sent with a single click.

MessagePal will provide simple, secure, instant messaging between users on your LAN. Only two minutes to download and install, MessagePal is a peer-to-peer system requiring no central server or administration.
This cost-effective LAN messaging system provides unique workgroup features not found in consumer-oriented, ad-supported IM services or even more expensive enterprise messaging systems.
Easy to use and administer. Group lists, 1-click Replies, Message Forwarding, and many more unique features!
MessagePal Features:
1. Fast & Efficient:
Communication is brief, silent & confidential. A single click can send a complete message or reply. User interface is designed for very quick and efficient messaging.
2. Low Maintenance:
Requires no server or administration.
3. Ready to Serve While Unobtrusive:
Stays as a small icon in your system tray until you need to send or receive a message.
4. Secure:
All messages are encrypted and stay within the local LAN, inaccessible by intruders on the Internet. The result is private internal communication without the risk of messages being intercepted by outsiders.
5. Customizable:
Add 24 canned message replies for 1-click access or type your own. Each message can be sent to one or more users, one or more specified groups or every on-line user.
6. Productive:
Reduces or eliminates interruptions, wasted walking or shouting, phone tag, miscommunication,
7. Fun:
Pleasing user interface and 1-click messages reduces the stress of getting quick information from colleagues.

The license of this software is Free Trial Software, the price is $39.98, you can free download and get a free trial.