telnet nodeallows a connection to node, from any other machine connected to the Internet. node itself will prompt for a logon name, then the password.
Logging on remotely allows users to use the UNIX/Linux commands, but not the Graphics User Interface of the remote machine.
Logging out of the remote machine will close the connection between the host and the remote system.
You cannot use telnet to connect to any of the systems mananged by the Research Computing Support Group: it was completely disabled in 2000.