Using SSH is simple, and very similar to the way the Berkeley r-commands work.
To connect to another host, type:
To connect to a remote host and run a command, type:
ssh <hostname> <command>
To run an X client remotely, the -f option usually works out best:
ssh -f <hostname> <command>
That will establish a connection and, once authentication is complete, will put the ssh connection in the background while the X client starts up.
To copy a file between hosts using ssh, type:
scp <host>:<filea> <fileb>
This would copy file filea, located on host host into the local file fileb.