Are you looking for a chat service while you are on local area network[LAN]? Then its time you should check out the stylish IP Messenger which works on multi playforms and does not require server machine and is a very simple and light application which can be easily used on any computer because you can easily get the files on to any computer.

To transfer File/Folder, Drag & Drop File/Folder to Send Window. (or select right button menu on Send Window)
File/Folder transfer can’t be completed until a receiver starts to download the file. If a sender re-starts IPMSG, the attachment file information becomes clear, and a receiver will not be able to download the file.)
The order of Send Message window header item list can be changed by Drag & Drop. Right click and select “Save List Header” for saving order.
IP Messenger is a pop up style LAN message communication software for multi platforms. It is based on TCP and UDP/IP.

Features of IP Messenger :
File/Folder Transfer. (Very fast!)
RSA/Blowfish Encryption of communication data.
Host name (FQDN) support on Broadcast setup.
Specifying NIC extension.