The Junkfood Lab, originally a real lab with tables and workstations named after junk foods, has evolved into the ``public'' department cluster of machines. Most graduate students now have terminals connected to large servers that are part of this cluster, and work on those servers or remotely connect to a variety of other remotely accessible junkfood systems. The junkfood machines are where all new students get their accounts, but you will probably also get access to private research clusters during your stay.
You can use the accounts command on any UNIX workstation to see a list of the machines that are available to you to use.
You can also cross-reference the output of accounts with the file /fs/domain/lib/machines/machine.info to see where these machines are or what operating system they are running.