PuTTY is a free network program that includes SSH, Telnet and Rlogin client for Win32 and Unix platforms. It also features an xterm terminal emulator.
PuTTY allows users to connect directly to other multi-user computers and multi-user Operating Systems securely using encryption.
Once connected, you are presented with a command-line interface that allows you to remotely issue various commands to one or more computers simultaneously.
PuTTY is the ideal tool for advanced users as it supports multiple network protocols and several encryption algorithms.
Note: PuTTY may be illegal in countries that have cryptography laws (China, Vietnam, Mongolia, Pakistan, and Belarus to name a few).