I don't have much idea as to what's happening - I'm just stumbling around.
i can see that, you started with a dell running pclinuxos2010-LXDE and you finished with a dell running KDE3.5

anyway, what you are trying to do is independent of desktop environment and should work across them
samba is made of two parts, samba-server and samba-client.
You need samba-client if you want to access shares on a remote computer on your network.
you need samba-server to be installed and running if you want shares on one computer to be accessible from another computer over the network.
After you have set up a share, go to pcc services section and make sure samba service is running. A computer will show up on a network if samba server is running.
Now back to your problem.
after you have make sure samba service is running on all your computers, open the terminal from one of them and type "smbtree --no-pass" ..what did you get? all three computer and their shares should show up.
What I meant was that I have set up a samba share in LXDE using the PCC in the same way as I have done successfully in KDE. But I cannot find out how to access it
if you have set up shares on your LXDE system, go to pcc services section and make sure samba-service is running and then go to another computer on your network and this system will show up there. You do not set up samba shares on one computer and then attempt to access them from the same computer.
I want to be able to easily transfer files between any two of my three computers (all running some versions of PCLOS). There's no security problem, I'm the only one doing this, and my location is remote. In the past I have stumbled around setting up shares and changing parameters until it eventually works.
make sure samba-server service is running on all three computers. If they are, all computer should atleast be able to see each other.
How to access remote shares on the local file system for access using PCC.
1. Make sure you have a package called "nss_wins" installed.
2. Go to pcc -> network sharing -> access samba shared drives and directories
3. Click on "search servers" all computers on your network will show up
4. click on the computer you want to have access to and then click on the icon that show up to expand the computer name to see its shares.
5. click on the share you want then click "mount point", you can go with the suggestion name or can change it if you want and then click "ok" and then click "mount" to mount it.
6, i think its best if you dont save these shares to fstab so say no when asked.