Please leave it on. In any case, if the machine doesn't come back with the usual login prompt, please notify a cluster attendant. Users who do this after a warning may find themselves unable to log into the PCs at all, remotely or not. A major source of such programs is the Free Software Foundation's GNU project, but programs have come in from other sources as well. See the man pages for details.
Some mice have wheels between the buttons.
For those mice, pressing the wheel is equivalent to pressing the middle button on a three-button mouse. You can print to the printers in the Kingsbury Machine Room and the Kingsbury 317 cluster from the Linux machines. The commands are the same as they would be from the login servers, as described in Section 8.5 of this document. If you have questions or problems concerning the operation of the Linux boxes, your first move should be to the Cluster Attendant.