[Warty] Newtork set up - newbie

[Lindsay]

Networking in Ubuntu
I have gotten my Warty PC partly set up for seeing the other computers
on my home network. I can access the Internet OK from two PC's, Ubuntu
and WinXP on another.  I want to be able to transfer files around the
network as I could do between two Windows PC's.

When i go to Compeer/Network the names of two computers appear there.
Clicking on either brings up noting as I haven't obviously configured
anything.  

How do I proceed please?