DynaTalk is an easy-to-use application that allows you to send and receive text messages on a local network. DynaTalk doesn't require special configuration or dedicated servers. Just install DynaTalk on two or more computers and run it ? you will be able to exchange messages immediately by sending messages to a computer from the list of DynaTalk-enabled computers.

Ссылка: http://www.dyna..ad/dynatalk.exe