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Users may connect to hydra.cem.msu.edu (the head node) with secure shell, or ssh. Files can be transferred to/from hydra with sftp or scp. Only the head node will accept connections from the outside world. The compute nodes are on a separate, private network and will only accept connections from the head node.
Mac OS X users can use the OS X command line versions of ssh and sftp/scp. A graphical version called Fugu is available on the web.
Windows ssh/sftp clients include Secure Shell Client and Putty.