PuTTY is a handy and reliable implementation of Telnet and SSH that also includes an xterm terminal emulator.
SSH, Telnet and Rlogin are three ways of doing the same thing: logging in to a multi-user computer from another computer, over a network.
Using this type of interface, there is no need for you to be sitting at the same machine you are typing commands to. The commands, and responses, can be sent over a network, so you can sit at one computer and give commands to another one, or even to more than one.
SSH, Telnet and Rlogin are _network protocols_ that allow you to do this. On the computer you sit at, you run a _client_, which makes a network connection to the other computer (the _server_). The network connection carries your keystrokes and commands from the client to the server, and carries the server's responses back to you.
These protocols can also be used for other types of keyboard-based interactive session. In particular, there are a lot of bulletin boards, talker systems and MUDs (Multi-User Dungeons) which support access using Telnet. There are even a few that support SSH.
LEGAL WARNING: Use of PuTTY, PSCP, PSFTP and Plink is illegal in countries where encryption is outlawed. I believe it is legal to use PuTTY, PSCP, PSFTP and Plink in England and many other countries, but I am not a lawyer and so if in doubt you should seek legal advice before downloading it. You may find this site useful (it's a survey of cryptography laws in many countries) but I can't vouch for its correctness.
What's New in This Release:
· Kerberos/GSSAPI authentication in SSH-2.
· Local X11 authorisation support on Windows.
· Support for non-fixed-width fonts on Windows.
· Specifying the logical host name independently of the physical network address to connect to.
· Crypto and flow control optimisations.
· Support for the [email protected] SSH-2 compression method.
· Support for new Windows 7 UI features: Aero resizing and jump lists.
· Support for OpenSSH AES-encrypted private key files in PuTTYgen.
· Bug fix: handles OpenSSH private keys with primes in either order.
· Bug fix: corruption of port forwarding is fixed (we think).
· Bug fix: various crashes and hangs when exiting on failure,
· Bug fix: hang in the serial back end on Windows.
· Bug fix: Windows clipboard is now read asynchronously, in case of deadlock due to the clipboard owner being at the far end of the same PuTTY's network connection (either via X forwarding or via tunnelled rdesktop).