You want the power and convenience of instant messaging, but don't need or want the clients to talk to the outside world. Be it a bunch of friends having a LAN party, or a large corporation - instant messaging makes working together easy. Unfortunately, existing instant messengers allow users to communicate with the entire planet, not just people on your local network.
Tonic changes this. With Tonic, you get all of the convenience, versatility and power of instant messaging, with none of the interference. This Ideal for the smallest home network to the largest corporation.
Tonic features the ability to have icons that can represent your feeling, mood, or character. You can use any of the hundreds of included icons or create your own, which will be automatically sent to other users on the network.