Using ssh, scp, sftp

SSH
The server node should be running the SSH server

sudo aptitude install openssh-server

Connect to the server

ssh username@ipaddress:port

Connect to the server with X enabled

ssh username@ipaddress:port

Note: specify port only if the default 22 is not being used.

SCP
scp can be used to transfer the files between the nodes (works on top of SSH)

From remote node to local node

cd local_folder
scp username@ipaddress:port:/home/username/path/to/folder_file .

From local node to remote node

scp /path/to/local/folder_file username@ipaddress:port:/home/username/path

SFTP
If you have a luxury of a GUI, you can copy using sftp.

Open nautilus (if using Gnome) and type in the location bar the address to the server.

nautilus --no-dektop --browser
Location Bar: sftp://username@ipaddress:port/home/username

Although you can go to the root folder as well, but is not a good practice to screw around in that area