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Secure Shell (SSH): This is important for us UNIX people.
Telnet is the typical method for accessing remote computers over the internet. Telnet allows you to connect to these computers via a command-line interface. Unfortunately, telnet provides an open tunnel that can easily be intercepted. If the information that you're viewing or the processes for which you are using the computer are of any importance, they can be viewed fairly easily by anyone with interest.
Secure Shell (SSH) is a secure replacement for the Telnet protocol. It is based on a principle similar to that of PGP (keys). Each computer generates a different key and the SSH client manages these keys for a secure connection. The SSH homepage is http://www.ssh.fi/.
Mac SSH Client can be found at: http://www.lysator.liu.se/~jonasw/freeware/niftyssh/
The Client's name is Nifty SSH.
Windows SSH Client can be found at: http://www.vandyke.com/
The Client is called Secure CRT.
UNIX Client can be found at: http://www.ssh.fi/
This is the standard for the other clients.
In order to use SSH the server to which you are connecting must be running a SSH server.