Setup of LAN
http://askubuntu.com/questions/107208/how-to-setup-a-lan-between-ubuntu-and-windows
I used the openssh-server and beyond compare.
In Beyond Compare i had to choose "SFTP (SSH2)"
It works great.
Chatting on LAN
Empathy
Empathy doesn't auto login.
Solution - http://www.omgubuntu.co.uk/2010/12/how-to-auto-start-gwibber-empathy/
File sharing Issue with Empathy