You have several technologies to choose from:
I find ssh to be the easiest, and most reliable. It's slower than the other two, but it's encrypted (which is a bonus due to the wireless connection.) To do this Perform the following:
On the "server":
1) intstall openssh-server using Add/Remove Programs or yum
2) ensure ssh is allowed through the firewall with System->Administration->Firewall (check the ssh checkbox and click apply)
On the client:
1) (optional, but if you don't you'll have to use the IP address instead of he host name) from the command line type: "su -c 'gedit /etc/hosts'". In the file that opens add a new line to the end and enter the IP of the server [tab] server's hostname (ex: "192.168.1.7 gandolf")
2) Go to Places-Connect to Server... select ssh. Enter the pertinent information (server and username are required, port is not). Have fun accessing the files from the server on the client.