PPPL Unix Cluster
In order to access the Unix Cluster from a remote machine, you will need to have ssh installed on that machine. You should ask the system administrator to do this. In addition, if your site has AFS, ask for the AFS patches to ssh to be made. The AFS patches are available at http://www.monkey.org/~dugsong/ssh-afs-kerberos.html.
[In fact, most of the functionality of ssh is available even if it's not installed by a system administrator.]
ssh examples ssh and slogin